Performance mods got a much needed improvement, and for the most part they are pretty handy (when used correctly). With all the posts concerning weapon talents and the Caduceus "nerf" I propose something similar to weapon talent mods. Would be pretty neat and allow you to really create some diverse guns. It'd work the same way as now excpet you get mods in place of talents. You can craft them, buy them, and loot them. Except you can replace them at your desire. To replace them cost a weapons kit (and maybe regular credits, still don't understand phoenix credit instead of regular) and each replacement is more expensive (just like now). Most people still stack 3 "OP talents" as it is and wouldn't lead to any game breaks (that I can foresee). Plus it gives more incentive for crafting and finishing content for credits and all that jazz. And heck you could even tack on more perks like stability and what not to each kod to create MORE diversity (nothing crazy high, like 2-4%).