Disclaimer: All of these would be purely cosmetic. Firing animations: TR: Have barrels glow as you fire. Belt fed cosmetic attachments. MOAR DAKKA NC: The weapons have a sort of recoil-dampener to visualise the high calibre rounds being fired. Some kind of charge up sound after a reload as the weapon powers up. VS: Instead of just pew pew pew and glowy stuff, how about a cooling system(like venting the super-heated plasam cores) after each time you fire at least 5 shots to prevent having to listen to it all the time. Doesn't have to be super noisy or anything, just something. NOTE: not suggesting all VS weapons get the heat mechanic on all weapons. Would love to see more suggestions on this, as I think there is potential here to ignite new interest in player studio items.
