What sniperduck said, that handy said.

whatever you want it to be the ideas are endless for this, im not recommending any definite weapons just the concept, and for the knife make it have a harder throw was my idea, or if you already bought 1, the ability to buy a second.

Instead of new stuff how about upgrades... EX. C4 level. 2 that makes no noise BUT cost 2 credits. OR a Teleporter that goes faster or you cant die while you teleport i have a lot of other ideas i thought of an upgrade for every single traitor weapon.