As I am a retired Army Infantry NCO, and have seen combat, I really like the way the infantry is portrayed as not just cannon fodder to find M.G. positions and piss-off tanks. I also like the "danger close" effect when calling in artillery. Where if you get friendlies to close to the target area they can get hit.
Now on to some things I would like to see. Light Mortars representing 60mm and German 50mm able to move on their own. I know "leg" infantry units and para units did not have the resources to provide motor transport. This is really true for the German infantry up to 81mm mortars as their TO&E had few transport vehicles (motor or wagon) below Regiment and the Germans through out the war remained largely a horse drawn army.
Another thing is stacking or the ability for units to move through panicked units. This would be very handy to bypass units when fighting in narrow streets where an armored unit can move through panicked infantry and blast that pesky M.G. that caused such havoc. Stacking would be handy when there is a limited number of cover spots and you want to place a M.G. as base of fire and have room for your maneuver force also.
Vehicle fording at ford spots instead of infantry style units only.
Combat Engineers able to take out tank traps and obstacles.
Speaking of obstacles and engineers how about concertina wire and mines. Wire stops infantry for one turn, mines removable by engineers and if you follow proper infantry tactics, all obstacles are covered by direct or indirect fire, so you hold your flanks with minimal forces.
And while I'm bashing on a already great game, how about smoke. A infantryman's best friend when crossing open ground or streets.
So now, have I made a point or have I been blowing cloudy pixels up your electronic keister. Tell me what you think!

Sincerely,
Anyman