[MasterOfTheXP]

Try making some configs for maps you want to disable the plugin on. Like, if you wanted to disable on a map named map_01, you would make a new config in cstrike/cfgs/ named map_01.cfg. In that, you can place commands you want to execute on that map, in your case sm plugins unload <pluginname>

If that doesn't work, you could always edit the source of the plugin to check if the server is currently running a certain map, and to unload itself or refuse to do anything on that map.