How about some changes to Outposts?
Considering the AI does not seem capable of upgrading Outposts, I suggest that we do away with the upgrade paths and simply apply a certain set of bonuses to them. How about a set Offensive and Defensive bonus of 25%, and maybe have them already have a zone of control like the high tower upgrade which is 3 squares? You could also have them reduce enemy movement by 1, which seems fair. I think this would help make games a bit more interesting. I often upgrade outposts at choke points and they really do a number on the AI.