Hey, I'm back to the game, and found a bug when selecting negative traits

Mods: essentially UCP + 5X if that matters

I actually selected Repulsive trait (which gives -5 points). Picking all positive perks I wished, and I still had 3 free points. So I decided to remove the Repulsive trait, in order to pick other negative traits. Removing the Repulsive made me have "-2" points.

Issue: When having -2 points available, I cannot pick "-1" traits (as if I don't have enough points to pick them). So I cannot pick two -1 traits. I have to unselect a positive trait, pick my 2 negative traits, and then pick back my positive trait, or keep the Repulsive trait,

It makes me think of 3 things:
1) negative traits should never be disabled
2) IIRC, in moo2, you can still pick grayed-out perks (which gives you negative total, but doesn't matter), would the same system be easy to implement ?
3) "Incompatible with the current selection" looks weird. When picking Repulsive, Dispositions, Negociations, and Treaties become yellow, ok. But all other perks should work the same, like Ultra Rich Home Worlds is incompatible with any other homeworld minerals, same for size etc... I also see the "+25% food consumption" is yellow when I pick "-25% food consumption" (well, -50 and Lithovore should then be yellow too ?), but production perks doesn't work the same. When I pick +25% production, nothing else is yellow...