when placed in the range of a fully built radar, buildings should auto-build (maybe repair too) at a slight rate like 1/4 engineer build speed this would be good for placing base defenses and reduce amount of maintenance required. additionally, that would put more of an emphasis on radars as a target in an assault
maybe scale proportionally with the amount of players. more people would play smaller matches (10x10) if they didn't need to have octopus arms to do everything.