Stuff customization of army and units
Let players customizate armies before play: choose units like making a custom army from a faction. Choose from a different tank models, aircraft, etc. I think you could do something like it on Generals, but it was only in-game by using general points and just with few units. Also like in CnC4 but player must be able to choose his own units to build an army, also with tecnologies!
Building army in this way require to "buy" your units from limited budged, which is the same for all or instead of budged let players chose from different models with different armor,speed, weapon or habilities. KW Nod example: In KW Nod has 2 extreme range units, specter and beam cannon. My idea is to let you choose one of them in game but not both at same time.
Let customizate units features: speed, weapon, armor, skin and more.. Customizating a unit make it's price in game change. Example from TW: Predator tank with no changes costs 1100, with added rocket weapon could costs 1300. In some cases customizating a feature must keep others on default features to prevent balance trouble.
*In this line adding XP points system, unblocking new units or features like tecnologies that player can use to customizate his army.
Player adaptable armies. Different armies all time. Same factions with different units.
Waste some time in customization.