Spectator Mode for PvP

[Venom]

Many people do 1vs1 or 2vs2 in PvP maps and others wanna watch! (That sounds kinda dirty when you think of it ) The problem is, players end up hitting the spectators. Can a spectate mode be added while in PvP map? Maybe if you join as a spectator, you can enter even if a map is full. If you are already in map, maybe a command /spectate which turns you invincible/invisible and nobody can hit you and vice versa. All you can do is browse/fly thru the map with a fixed/free camera and watch what's going on without interrupting the game. Counter strike has this option of spectate.