[ConnorMcLeod]

I guess it could be usefull to play deathmatch in FFA mode, cause when you shoot a teamate, you don't make same damage as when you shoot an enemy.

Can be usefull for kz servers too ('CT Only' plugin), some kz maps have T spawns and it's very anoynig when a player comes, pick up T team, and game restarts...
So you can let people choose CT or Spec.