friendly fire on/off option?

[ExodusS]

Make a command for admins who can able/disable friendly fire for only one player.
Like /kick cn.
It should be something like /friendlyfire 0/1 cn for teamkillers.
Only able to vote this in public and only for admins. (for matchs on interclans)
It should let'newbies more time to learn playing with any teamkills.