1. unit purchase phase have vehicles and units displayed in 2d or 3d models for easier identification.
2.better description of vehicle or plane loadout in unit purchase screen ,instead of just su25 heavy close air support it would read su25 2 /500kg bomb 60 he rocket etc.
3.weather effect like blowing wind and rain.
4.change units formations in battle, to wedge or line etc.
5.helicopters units that can land and unload troops or carry anti tank guns.
6.derivable suicide vehicles.
7.air dropped supplies from a plane.
8.use 100% of modern cpu and gpu.