I'd simply like they could do like the humans, namely they can't retain targetability on a tropper that has been spotted ONCE.
This causes all the most difficult situations in which a single mind control snowballs in a mess, since Aliens may uncover ALL your positions as soon as turn (say) 3 and then *never* forget.
I know vanilla plays like this but (to me) it s serious unfun that once spotted there's no way to get out of that crap....I do not like to play without possibilities, had there been a countermeasure that I fail to employ or some hard tactic....it would be different.
Of course once psi aware you can select & train soldier that weather down psi attack very well, and in turn make the game crazy easy with psi attacks.....having a specular handling of psi powers could do the trick for a while but once you have a ocuple superhumans the tide is on your side anyway.
Limiting Alien psi range may "mimic" the fact that while still out of the UFO only a few aliens could be able to psi-attack you.
Breaching the UFO still, would still provide quite a challenge.
Too bad that's hardcoded, I'd really like to try alien psi that plays like the psi-amp (or as I call it the "everywhere sniper").