I like the idea of diplomacy points in principle, even if I do not use diplomacy in its current state, but am wondering about one small aspect of it: spending diplomacy points to end wars. In other 4X games I know, bargaining for peace usually entails signing a treaty which prevents hostilities for at least X turns (10 seems quite standard), and for good reason. Apparently, not so in SiS. In SiS, spending points on peace seems absolutely moot because peace lasts less than one turn: the AI can declare war on you again at the end of the turn. Not only does this feel bizarre, it deteriorates the functionality of the bargain to the point of uselessness. Could you consider doing as others do and add an X-turned-length treaty aspect whereby X is larger than 1?