[Unknown_Enemy]

For Jmenschenfresser's treaty problem, and should I run into them before the Tyrean fade away from their deficiencies, I would propose to work out the following :

if a trade & research is concluded with only part of the tribes, I would propose to reset it at regular interval, which would reset the percentage of data/material gained, thus simulating the fact that only part of the tribes are making business with you.

I cannot imagine how to deal with war/trade&research/non agression/trade/trade&research situation. But that would make some coool stories...Miam !