Some funny cheats like bigdaddy or photon man would be great.
Maybe a cheat wich starts a battle royal or dead units become zombies.
Sorry for bad english, i am still improving 
What do you mean with some?
I will all cheats or more 
Oh yes please keep all the old cheats. They are just so much fun to mess around with in singleplayer games. You could even build gamemodes around the cheat units for fun.