As a superadmin, please go to your game console and look up the following ...type "ulx help".
You'll see many commands, two of which you might be interested in.
o ulx luarun {command} - Executes lua in server console. (Use '=' for output)
o ulx rcon {command} - Execute command on server console. (say: !rcon)
There is no way to run most sv_cheat type commands locally, no, if sv_cheats is on, which it should always be due to it's security risks.
All of those commands are available also in XGUI (as a superadmin).
All of this is covered in the ulx help and our FAQs area.
Please spend time looking through our FAQs and help.
Thanks.