Afther some short rounds of core and TRP(Darkest Hour) for comparsions and a new round as Us. I have some more suggestions and comments.
Quite a list, glad I'm retired and have the time

I'll try to address as many as I can based on the current 1.13 done, in process, and planned. But we are discussing AOD, correct?
Adding Earlier light armor brigades (1917-1937/8 most armour was fairly light)
This can be done. Currently, AOD has a whopping 1...yes, only one type of light armor. Any suggestions? We could add more light armor brigades based off of the light armor divisions. This would give us 6 light armor brigades (Great War, Tankette, Early, Basic, Improved, Advanced, Semi-Modern). However, I'm thinking of adding 2 to 4 more types of light tanks that would extend them pass the 1943 (Advanced) light tank into the early 1960s. I'll need to do some more research to extend the light tanks by looking at US, USSR, UK, French light tanks and let's not forget those light tanks that Airborne forces use.
Adding Earlier armored car brigades (first ones where in use around 1900)
We could do this. We need others to say if they want to see more armored cars and what years need to be added. Let's see what others think.
Personally, I think that armor cars shouldn't go pass 1945 since IRL they became APCs (Armored Personnel Carriers) of the post WW2 Mechanized and Armored Divisions. Even when one thinks about Army scouts use/used APCs and more modern use IFV (Infantry Fighting Vehicles...e.g. Bradleys, etc.)
Adding light infantry divisions:
Higher air-attack/air-defence values for most divisions either as something like 0.5/1 per level or as a seperate tech for integrated AA:
Giving higher air attack and air defense capabilities to land divisions, I do not think it's a good idea. This is what the AA brigades are for, and maybe they need to have higher air attack and air defense capabilities. Also, looking at the Tactical Bombers and CAS to land divisions. IMO, IRL land divisions are very vulnerable to CAS and a little less to Tactical Bombers. If a country doesn't have air superiority, their military forces and infrastructures are vulnerable. Think of all the wars and battles where air superiority turned the tide or event decimated enemy forces...Battle of the Bulge when the fog lifted, etc.
Values of brigades should be rebalanced a bit, right now there is no reason to use anything other than art/spart
Agree, but can you be more specific? I actually believe that arty and sp shouldn't be available to any unit other than HQ. IRL there was never enough Arty and SP brigades to supply each land division with one. Arty, SP, Tank Destroyers, ADA, AA, Engineer, etc. brigades are Corp (or higher) assets. Example: The US Army has 4 active Engineer Brigades...18th, 20th, 130th, and 555th Engineer Brigades.
However, it's not about my opinion, but what the majority of players want. So folks, let your opinions be known. Other than bugs, this is how the release teams determine what gets into which releases.
Light cruiser research cost lowered from 5 to 4 and destroyer research cost lowered from 5 to 3 (never made much sense that a destroyer has the same research cost as a heavy cruiser)
I quickly did just a cost comparison between Early and Basic Destroyers, Light Cruisers, Heavy Cruisers, etc. Basic (1936) Destroyer cost is 5, Basic (1936) Light Cruiser cost is 4, Basic (1936) Heavy Cruiser cost is 3.5, Basic (1936) Battlecruiser cost is 5.5, and Improved (1936) Battleship cost is 8. We have to factor in the cost and time since the cost is a per day cost (IIRC). So now one has to determine the overall cost in build time and cost to build each ship. So:
- Basic (1936) Destroyer cost is 5 x 140 = 700
- Basic (1936) Light Cruiser cost is 4 x 210 = 840
- Basic (1936) Heavy Cruiser cost is 3.5 x 320 = 1,120
- Basic (1936) Battlecruiser cost is 5.5 x = 2,090
- Improved (1936) Battleship cost is 8 x 510 = 4,080
So one can see how cost must be paired with buildtime.
Early fighter/bomber tech could maybe also have a bit lower research cost
- We'll need to research this possibility
More ship/unit/squadron names
This can be easily done. Everyone reading this, what countries need their lists of ship/unit/squadron names increase? Also, think about the countries that can be released.
Since the ai is just bad at upgrading its provinces having the ability to build province upgrades for them is a neccessary evil and maybe infrastructure upgrades should be added as well
In AOD, one can easily upgrade province infrastructure through the Production screen. Additionally, we have new random events that "discover" (give):
- Rare Deposits Found - Adds 1 rare to a random province
- Oil Drilling - Adds 2 oil to a random province
- Bumper Crops - Increases supplies by 500
- Coal Deposit - Adds 5 energy to random province
- New Ore Deposit - Adds 3 Metal to random province
And (though I hate to mention it) these events could be called (F12) as cheat codes if someone likes to use them.
Maybe add an event that gives the soviet union some locked in place Light Infantry/Militia/Garrison in major cities when they get attacked by germany
IC and Infra buildlines for Stalingrad should be added it was a major industrial hbu afther all
I really don't see this happening with all the manpower that USSR has, but I defer to someone more familar with the Soviet AI...Hey PB-DK, Tag you're it

AI britain and germany should get some antiair and radar per event they usually have to little or non at all in comparsion to what they had irl
This has already been done in the 1.13 Developer release. So it'll be in the 1.13 release.
Submarines stay in combat way to long since there is no dissengade from combat button reducing their total org to 3-9 helps somewhat
Also add in those "stealth" transports with invisibility cloaks and speeds of a PT boat that can engage and hold off a battle group of battleships, cruisers, and destroyers. Naval combat isn't my forte, so someone else on the team will need to discuss this here. However, I totally agree with you.
Either double the morale gain or half the org gain from air doctrines (helps a bit with the ai habid of constantly rebasing air units and having no org as a result)
Yea, I'm not a fan how much hit air units take on a rebase. I'm also not a fan of how long the transport planes regain org after dropping airborne. I even manually tripled the org, then did a 3 province move, dropped airborne, then reloaded another airborne division, and then had to wait days before that same transport could perform an airborne mission. It's like the ground crews for the transport planes went to the PX, then to the movies, then to breakfast, lunch, dinner, then to bed, the showers, wrote 10 girlfriends letters, and finally decided to refuel the plane.
In the misc.txt file (which mods variables within the "hardcode"/AODGame.exe) you have the _CV_AIR_ORGGAIN_ (Org Gain divisor), _CV_AIR_ORGLOSS (organization loss when moving), and _CV_AIR_MAX_DISORGANIZED_ (how many days is max disorganized) that affect air units. However, modifying the misc.txt file are global changes across every country and all aircraft. This is something the team needs to discuss and if any changes are required, it will need to be done within the "hardcode."
Please remove the connection betwen Petropavlowsk-kamchatskiy and Komanderskije Island it can create stacking problems for a german allied japan
I'm not familiar with this issue, but it would be an easy fix to disallow movement between Petropavlowsk-kamchatskiy and Komanderskije.
Adding self propelled anti air (spaa)
AOD has mobile AA already (1.13 even has SAMs), which are SPAA and ADA
Maybe add an ai switch for Italy that if gets kicked out of africa instead of trying to reinvade with 1-4 divisions it instead sends those divisions to help against the USSR
I wouldn't do this if Italy gets kicked out of Africa. If they got kicked out of Africa, then Sicily and the push-up the Italian boot is coming next. Italy needs those troops in Italy.
I suggest that the US and USSR get some more cavalry divisions/boni and a mixture of light tank and armored Car brigades
First off, what is boni? Currently, the 1.13 release has 8 different Cavalry Divisions. They are Great War, Early, Basic, Semi-Motorized, Motorized (new), Mechanized (new), 1943 Armored (new), and 1946 Armored Cavalry Divisions. Then we can do the extra light tank brigades (above).