I tried that already but it don't work. You can choose spectate at the beginning but you can't switch to the spectate team without rejoining the server. My config file will probably be useful. Rcon password and email removed.
Code:
hostname Clan LBZ -= Not Recruiting =-
rcon_password REMOVED
exec banned_user.cfg
exec banned_ip.cfg
mp_logdetail 0
mp_logmessages 1
mp_timelimit 60
mp_autokick 0
mp_autoteambalance 0
mp_c4timer 30
mp_flashlight 0
mp_footsteps 1
mp_forcechasecam 0
mp_freezetime 3
mp_friendlyfire 0
mp_hostagepenalty 4
mp_limitteams 1
mp_roundtime 4
mp_tkpunish 0
sv_restartround 1
sv_maxspeed 320
sv_proxies 1
allow_spectators 90
mp_startmoney 800
mp_chattime 5
sv_allowupload 1
sv_voiceenable 1
sv_alltalk 1
sv_voicequality 5
sv_voicecodec vaudio_speex
pausable 0
decalfrequency 40
mp_falldamage 1
sv_aim 0
//Enabling sv_cheats will allow anyone to execute rcon commands and add/remove admins
sv_cheats 0
sv_maxrate 30000
sv_minrate 0
sv_lan 0
sv_contact [email protected]
sv_region 0
sv_maxupdaterate 120
sv_minupdaterate 20
sv_unlag 1
sv_maxunlag .5
host_framerate 0
// Redirect downloads to remote server... :)
//sv_downloadurl ""