@Leoreth: Oh. I should've re-read your earlier post about this modifier before searching for the source code. You obviously weren't talking about the leader penalty. Thanks for pointing me to the right place. Great, I think I'll merge that and set it to 0 by default through EraInfos. Maybe separate values for human and AI. And see about the information leak later – which may not even bother the relevant players (not sure if it bothers me either).