In BG1 and I had previously thought BG2 as well, but possibly I am mistaken, you cannot backstab with any weapon a pureclassed thief cannot backstab with. As far as I know these weapons are hardcoded into the game, and not changeable. They are possibly marked with a certain flag, or maybe if you change a weapon's usability to include thieves, or maybe it is even in a 2da file. But I am pretty sure it's hardcoded. Wait for someone who knows more though, I'm hardly an expert on this...
-Brainless One
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