The 32 player servers do have spectator mode disabled as a result from having the Auto-Assign set on. Considering players were ignoring the auto-assign and then joining spectator (after the auto-assign) to then stack the teams that is why it was disabled.
Unfortunately the side affect is that you can't go into spectator to record demo's as easily, but you can still do an !Admin call and if available an Admin will have a look at the players for you. (Admins can still be spectators).
" " - Silent Bob
Gamers can really come across with a pathetically huge sense of self entitlement at times