New chain command.
I would like AoD to have a chain command similiar to Hoi3's one. Or may be I am asking to much.
Major Generals and superior may be attached to divisions individually.
Lt. Generals and superior may be attached to corps, that are usually of three divisions. Their bonuses should be halved (1/2).
Generals and Field Marshalls may be attached to HQ and their bonuses should be halved (1/4). The HQ would belong to a unit that can also have attached another corps and/or divisions that may not be in the same province. There should be a malus for distance from the HQ. If there is a field marshall commanding the HQ, there can be another HQ, commanded by Generals, attached to the Field Marshall's HQ, their bonuses are again halved (1/8).
At air and sea, lowest commanders (rear-admirals and major generals) can command individual ships/squadrons like land divisions. Units with several ships and squadrons could be commanded by vice-admirals and Lt. Generals. The two higher ranks, in the same ways like Generals and Field Marshalls, can command HQs and can have units attached. This HQ should be at their land bases, they are not sailing or flying. Their bonuses should be reduced like land commanders and there should be a penalty from distance from the HQ. So you can use HQ to command Units (of the size of corps) of land, air and naval forces.
There is still limit to stacking, that could be modified in misc.txt. Obviously, major generals can only command 1 division. Lt. Generals could command a corps of 3 divisions. Generals could command an army of 6 units (1 HQ + 5 corps/divisions). Field Marshalls could command an army group of 9 units (1 HQ + 8 armies/corps/divisions). There should still be penalties for overstacking (old -75 penalty).
There should be a "stacking" button with each army/armygroup HQ to reduce micromanagement. By selecting this button, all subordinated units recive the same orders after that moment. When this button is on, you can only select the HQ. So, you can give the same orders to a whole army/armygroup and all the subordinated corps move together. When you turn off this button, all the elegible armies/corps can be selectable again and move separately. This option allows player to forget to move his HQ after their units when in advance. For example, you can group a hole army (1 HQ + 3 corps = 10 divisions) to order it to move and attack with its units together.