An addon for xAdmin that allows you to set a secondary usergroup in addition to their primary usergroup.
xAdmin. If you don't install this xSGroups will throw an error and refuse to work.
Just drag this into your addons folder and if needed, look at lua/xsgroups/_config/sh_config.lua to change xSGroups' config (Includes the secondary groups themselves.)
Check out the wiki
If you have any ways to improve it, feel free to create an issue or a pull request.