Hold shift to run (with run gani ), rather than double tapping to move a tiny bit faster.
New Modes of gameplay on planets, modes like Zombie, VIP, Search and destroy, and Darkness! (Almost complete darkness/fog, bullets flash to reveal your presence...
Grenade clicking. I dislike grenades being pretty much like a directional fire gun. I'd like to see grenades being able to be thrown to a certain area you highlight with your mouse.
Perks! It's sorta unoriginal, but it makes so many games more fun, as you can from a few different perks! (Perks being abilities/skills that make you do something a little better; run a bit faster, shoot a bit faster, maybe phase out for a second (w/ a cooldown) to avoid bullets, more hp, more en....)
Flash grenades, smoke grenades! I had both on my old wartime server and they were fun!
Flash grenades make the screen of the nearby enemies turn white for a moment (and the white fades out), Smoke grenades make the white cloudlike particles you can walk under and such.
More advanced Radar! I wanna see my allies moving smoothly when I press m, I don't want to see jerky teleporting markers.
Updated Landmine graphics....
An urban map (these were fun back in the sog days, though it wasn't exactly modern ,you had houses and such to enter all in one, big gmap. )
Highlighting! Press M and mark a position on the map for a few moments for all your teammates to see.
I have more, but I think I put enough XD