Usability / Convenience
-Have a in game option to not see cosmetic items, or specific cosmetic items/slots.
-Have a better Colo(u)rblind mode than a picture over people covered in piss.
-Make no rag dolls/shadows a video option via the in game options
Competitive related
-Make Footsteps slightly louder, at least in the comparison to maps background noise/explosions
-Add/Smooth animations/hitboxes to people spamming crouch in air
-Make it so shadows don't render through walls
Servers
-Allow servers to have tick rates higher than 67/s i.e 100/s, 134/s
(btw, for those who do not know this would improve hitscan hit detection, and allow for lower interps)
STV Related
-Have moving a camera move on a Z axis bound to keys by default
-Make the 3rd person Camera a little further out
-Add the ability to see players through walls like the casting plugin
Map Changes
-All those little places where I can see someone with literally nothing obstructing my view, and being unable to hit them because of a invisible walls sticks out a little to far.
DX 8
-Flashing uber like the guy above said
-Cow Mangler Projectiles / Explosions
HUD
-Able to see teammates health / players health if in spectate with default hud