....and kidnap your dog
Whew. My 4 cats are safe!
Ahemm....
* JamminR clears his throat.
In partial agreement with RoastChicken's input.
Don't over think it.
I'm not sure this is a ULX limitation, so much as a Gmod limitation.
To Gmod, we are all users, unless we're admin or superadmin.
Use ulx groupdeny minge "ulx command_you_don't_want"
o ulx groupdeny <group> <command> - Remove from a group's access.
Deny's take precedence over allows, no matter who is inheriting what.
You'll need to deny each command individually.
XGUI should allow you to do this too I'm pretty sure.
As for noclip denial, you'll need a new mod.
Or, take away server noclip, and allow ulx noclip to the lowest group level you want (which seems to be users in your case)