Yep, as far as I know the only way to make the UP chairman to be bound to a race (I. E. the Terrans) would be to modify the game's code. I was checking into see if anyone else had done it or tried to do it, owing to the multiple issues that may arise both with game balance and trial'n error. If you know of way to set the chairmanship without modding I'm all ears.

yep, especially as some factions which seem like they should always vote for themselves (imo the Alterians) don't, which kinda ruins the immersion for me. I think that having the Terrans set as the leaders seems to fit the lore better, and returns them to a position of diplomatic 'importance' which the current abilities have gutted (in comparison to GC 2).