Originally posted by OutlawTor
Vulture, please...
Regardless of how easy or hard the fix may be, it is still a valid request. There may be even an equally valid reason for not making a change, that would be an appropriate response, but the difficulty of the change shouldn't be the issue.
It is annoying in the game to invade by sea a province next an ally and then the ally to get control of the province, even if no ally troops were involved and the invading troops came from one of your provinces. It makes supply issues, puppet/annexing issues and future deployment issues complex and sometimes impossible.
It is historically inaccurate too. Staging armies and attacks from an ally's territory did not usually result in the ally taking control of the captured territory unless the territory originally belonged to the ally.
Well the carve up of Yugoslavia and Greece or the gains that both the Romanians and Finns and Hungarians made against Russia, or Frances occupation territory in German, or Poland's gain of the Oder Nisse line leave me unsure about your claim. However perhaps the algorithm is too generous? Gains of provinces right next to your ally did happen, however gains deeper into territory are less common.