1.
Experience for units and specific gained traits like rivercrossing, urbanfighting, fighterace's, superior tactics etc.
The exp for the units gathered in blood and harsh fighting, could maybe be used to buy some of these traits. If a units looses to much of its strenght, maybe they should loose some accuired trait or traits.
Effect = Adds mikromanagement(does it really?, no just more stats to keep an eye on, unless the "buy" trait for exp becomes available, then it really adds mikromanagement like playing with Russia keeping and eye on 300 divs.)
2.
Experience for commanders, like the gain traits in Panzer General, tanasious defence, bridgebuilding etc, should be gained when they reach different lvls of exp. Rommel should have the posibillity of gaining traits like Panzer Ace(under the traits "Panzer" there could be a tree like, panzer novice, panzer assault, panzer blitz'er, panzer defence, panzer desert war, panzer winter war, Panzer ace/highest rank/all skills learned) furthermore could he learn skills like Surprice Attack, Supply Genius etc. Each trait should have a tree structure. The same tree should/could be used for the unit traits.
The Italians could have some bonus traits like "allways cowards"

sorry
So an armoured division with Guderian in charge in early 1940 could have:
1. Panzer div
Bridge crossing lvl2(Poloand)
Panzer Assualt lvl3(Poland)
Tanasious Defense lvl1(Basic training/Panzer Lehr schule(panzer academy))
etc.
+ the skills from Guderian himself, say;
Panzer Ace lvl6(Poland)
Outflanking lvl6(Poland)
Blitz lvl6(Poland/Panzer Lehr Schule)
Night Defence lvl2(Spain) (just an example)
The units should also have its natural stats from HOI offcourse.
So completely loosing a division in the later part of the war, will be a greater loss than the men and material, it's also the hard gained knowledge.
Another effect, it gives you a more familiar feeling with the units, like you felt with your units in Panzer General(which I don't have in HOI)
Another effect, though it's more difficult to discribe, Hardcore gamer would(like most in here) love to gather the most effective units and commanders, with this feature it becomes even more fun.
Before flaming this large suggestion, I know this also gives more micromanagement, but hey, its a WW2 game, not a civilization game like VICKY
Effect = Adds mikromanagement(but the fun kind)
3.
The possibillity of choosing auto Promote general, when reached 5 stars/100 points, or when it's most beneficial
Effect = Reduces micromanagement
4.
The posibillity to give the Army Command to a FM/General in a specific theater of war, say Pacific or North Africa, with some basic commands/orders like attack or defend this territory/area
Very useful when playing with the majors. (Could be made the same way, vassals work in CK, but with more AI and options offcourse)
Effect = Reduces mikromanagement
5.
No AI cheats/the AI has to play the same way humans do, no unlimited range etc.
Forcing the development of the AI to be better from the release date.
Effect = playing by the same rules as humans, AI cheats sometimes make me MAD
6.
More manageble OOB's, I want an ingame OOB tool, to organize my army in Corps, Armee's etc. Maybe like a "drag and drop" function. It should look something like a hieraki from a ol'fashioned company.
Effect = Easier to manage the organisation of the armies.
7.
Auto repairs of tanks, planes, halftracks, trucks etc, because in my point of view, tanks is like people, they can get disabled because of a defect fuelpump etc, and then they can get fixed again, this results in when units are in combats, that a certain % is disabled and another % is destroyed, only the disabled value regains it strentgh and org. If you loose a battle most disabled tanks, should be lost as well, since your primemovers can't come and pick'em up.
Effect = Adds mikromanagement, but it gives a more realictic feel in the game.
8.
Modding tools
All these tools should be made so modders easily could start modding the game from when its released/or when they finished playing it after some months
Build army/navy/fleet tool
Improve province tool
Organize worldmarket tool(or the way econemy will be in the finished version)
Event tool
Give TECH tool
Create Country tool
Effect = Pleased community, which is Paradox's bread and butter
Effect = Increasing THE VALUE for the gamer of the purchased product, when mods starts to appear.(would you ever buy a game with NO community attached? I would'nt)
Accurate Army Rank system for the Majors
Effect = Eye candy, but to casual gamers it could be diffucult to determine which rank is highest in japan or germany, to hardcore gamers WAAAAUW
Feel free to start commenting my wishes, suggestion, hopes and dreams.
/Frank2u