This is a simple asymmetric team deathmatch mode. The team of many can use only melee weapons and the gravity gun's punt, while the team of one can use weapons normally.
The red man cycles after dying a few times, configurable with sm_redman_kills.
Start the mode with !redman and stop it with !noredman.
I'd appreciate any criticism on the structure of the plugin, for instance is it a serious performance concern to put things in OnPlayerRunCmd?