You can always use the more advanced DM plugin that already has multi-cfg.
https://forums.alliedmods.net/showthread.php?t=233685
As for my plugin... The plugin works, be it there are some bugs in that version. People unfortunately do not wait for SM to update to say the plugin isn't working, but since my test a few minutes ago, it is working without any crashes. I do; however, have a version that is being developed that works with multi-cfg if you wish to help test it out. Just hasn't been released since I need testers and contributors to have any desire to release it openly. Just message me and I'll get you hooked up with it, should you have desire to.