[splewis]

You can try this plugin I put together from the teamlocker pugsetup uses. Just add maxteamsize.smx to addons/sourcemod/plugins.

There used to be an "exploit" with teamjoins where you could leave your mouse hovering over a team and after 15 seconds it would auto-put you on that team, without sending a teamjoin command. That's why it forces that 15 seconds to 60 minutes. (and the mp_forcetime cvar or whatever sets that 15 second timer is broken)