i think it would be great to have this feature in a tech level option in skirmish. tech lvl 1 is infantry tech lvl 2 is previous lvl + WOR tech lvl 3 is previous lvls + QUAD ... tech lvl 10is previous lvls + Castle, which means everything(all technologies: infantry, tanks, special weapons, etc.). I've restarted playing Red Alert(the first) and this is how Westwood implemented the system. So the player has the option to play skirmish with infantry only or with everything. With this option, i think it gives the player a choice of decision as of if he wants to play inf only or with evrything.