thinking about a recent update that let you choose a different hitsound for when you killed someone, there's a lot of small things in TF2 that make the game more accessible as a whole, with little to no downsides. I'd like to see what other neat little changes you could do. stuff that doesn't really modify the game heavily, just makes life easier for everyone involved.
-notifications somewhere on the screen that tell you when someone respawns, so you don't have to switch to scoreboard constantly to check when the enemy medic respawns and whatnot
-a hotkey to switch between the three resistances in vaccinator without cycling; like, you hold down +attack3, and press A, S or D for each of them
-a pre-game that lasts like five seconds in spawn before going to mid, so you don't have to care about spawn positions and can just hang out next to the door before the round begins