Thank you for the rating.
You can already do that by creating two separate configs. One for admin one for user.
Create a config called admin.yaml and one called user.yaml configuring the limits you want inside those configs.
Then add the permission slimits.limit.admin to the admin group and the permission slimits.limit.user to the user group. The permissions come from the config names.
See the documentation for details:
https://github.com/Silthus/sLimits/blob/master/Readme.md#permissions