I thought of some more features:
Control Group/Mark Opponent's Units
Why? Well it would make it much easier to keep track of your opponents units if you could mark them in some way. For example, if I mark all my opponent's 4 rifle squads 1-4 and I notice 1,2 are on the left part of the map and 3,4 are on the right, if I note that 3 has come over to the left, I know that 4 is on its own, so I can send a vehicle over or whatever.
Another example, I mark my opponent's first Panzer IV when it comes out, but then another P4 shows up with no marker, I can deduce that they're on their second medium tank.
It would be great then that if I double tapped 4 it would pan the camera to the opponent's unit if it is within LOS, so I can quickly note 'okay, there's the Tiger, let's go over to the other side of the map'.
This feature really depends on the extra control groups feature being implemented.
More Alerts Improvements
It would be great if you could filter out certain types of alerts that you don't care about. For instance, if you don't really care that much when 'Enemies are spotted', in the settings, if you could configure that Alert type off, that would be great as it reduces noise.
Even better if you had hotkeys to toggle 'Alert profiles'. An Alert profile is basically a collection of alerts and whether they are toggled on or off. The basic idea is that; you may want to see a certain group of alerts at different points in the game, for example, at the start of the game you might care about Enemy being spotted or territory being captured, but you probably don't care later on in the game as its not your priority, so if you had a 'Late game alert profile' where these alerts don't show up and was triggerable via hotkey (because nobody wants to dive into the settings mid game), this would be quite useful. Having this tied to your hotkeys profile would make a lot of sense.
Also having a one time alert notifying you that an Alert profile is active would also make sense:
This is what the alert screen would look like:
As you can see, it also allows you to colour code the alert text as you like.
Improvements to the Minimap
I thought of another idea in this field, it would be great if you could toggle (via hotkey) 'show control group numbers on minimap'. Some players might want to see where their control groups are on the minimap at a glance. It would be better if it was a toggle as you probably wouldn't always want to see this, as its noise, so having the colour distinction would still be useful.
Looking at the map below, if you always have your pioneer on control group 1 and this is configured to being purple, you can tell at a glance that if your light vehicle at control group 3 has engine damage, where you need to reverse to/where your pio needs to come from.
It would also be nice if in the settings, you could configure whether or not 'control group numbers appear on the mini map' is on at the start of the game.