Just a thought: It would be a real treat if you could restrict certain weapons to certain Soldier-Types e.g. alien weaponry useless for humans, but an alien ally can use them etc.
Just like with armors, which is already possible.
Or maybe restrict Categories....
Not sure this hasn't been proposed before, so please spare with me if it has. I know one can fiddle around with psirequired and/or making weapons extraheavy and certain units/armor extrastrong, things like that, but a direct solution seems plausible.
Unless there's some hidden evil effect that I do not see...