
1) like what other ppl have meantioned, static defences, like infantry able dig foxholes and place snadbags etc...
2) modify infantry so they arent so helpless against a tank, that is very annoying.
3)a force order option so that if you want to charge, retreat etc.. you dont have to wait for your infantry to creep up there as slow as they can go.
4) air support, like strafing runs, and when you buy paratroopers you can choose if you want them to jump in, in a certain region