[Barnacle Bill]

Originally posted by Sinapus:
More to the point, peaceful races should not colonize in systems controlled by allies w/o asking. The main reason why I don't engage in treaties (except with neutral races) is because I know the race, regardless of attitude will send tons of colony ships onto planets I plan on settling later.

Exactly - it guts the diplomacy system, because making any alliance higher than NI means giving up control of your own territory to your ally. The only thing you can do to stop them when they try to colonize your systems, which they WILL do immediately, is cancel the treaty and declare war. Better just not to agree to a treaty in the first place. That is the problem my proposal was intended to fix.