This plugin is written to bypass the restriction of loading valve server plugin files after a map has been loaded. The following response would normally be
"plugin_load : cannot load a plugin while running a map" on games affected by this. This means you have to restart the server and load the VSP using only a VDF file. You can instead load this sourcemod plugin (late) and gain access to use the command without a server reboot.
This may not work on ALL source game versions as it has only been tested against cstrike and tf2. The code which blocks the plugin_load appears to be mostly the same between game engine versions. If you test this against another game and it works please post below so I can add it to the list. If theres an issue with it not working also post so I can add support for it.
Install Instructions:
Place the 'VSPLateLoadFix.txt' inside of your 'addons\sourcemod\gamedata\' directory.
Place the 'VSPLateLoadFix.smx' inside of your 'addons\sourcemod\plugins\' directory.
Use sm_rcon or rcon to issue command 'plugin_load VSPLateLoadFix'
or just change maps.