It might be a bit outside the scope of cm but I would also like to see Illumination munitions modeled in game. It'd probably be more practical in the ww2 games or for armies that don't have much in the way of night vision.
After playing the South African campaign in FI, I'd like to select an afv and have the option to select how many rounds I'm going to shoot at a particular target, (in addition to regular target commands) and what kind of ammunition I'm going to use. Obviously this wouldn't be too practical for vehicles equipped with autocannons and mg's, but it would be useful for tanks, assault guns, howitzers, mortars etc. I understand that "target briefly" is a thing but sometimes I don't want to shoot a target with my coax, and I only want to shoot it once. Just a to have a bit more control over ammunition consumption and ration it out in situations where you have to make your supplies last.
I'd also like to see the addition of formation orders for infantry squads as well as vehicles. I think Moving vehicles in column formation is a bit tedious as it is, and when I'm playing with a lot of units on the map a traffic jam or infantry blob is going to be inevitable unless I meticulously give every single unit in the battalion pause commands and waypoint orders. Just a small QoL improvement to help you get to the fight a bit quicker.