Making items unusable by swashies and bounty bouncers is easy. The thing is, I am not sure if making the item unusable by non-kitted thieves is possible, due to the hardcoding of item usabilities. I have done a test run with a couple of items, one with the usability bits for normal thief AND assassin ticked, and one with the assassin usability flag set but the "thief" flag set to unusable. Then I CLUACOnsoled each item into my assassin's inventory, and as I suspected the second item (the one that is seemingly set to be used by the assassin kit but NOT the "vanilla" thief) was not equippable.

So, can I assume that while it is possible to set an item usable by, for example, an assassin but not a swashbuckler by setting the right flags, it is NOT possible to set an item usable by an assassin but not a regular thief? Or am I missing something? And if I'm not, is there a workaround/coding "cheat" that can be used to circumvent this?