Question about whitelisting

I know how to set up a white list for server joining, however how does one set up a white list for a tool? (In Example: I want the Advanced Duplicator only able to be used by people on the white list). I have a DarkRP Dedicated Server and it is running ULX/ULIB admin. Any help would be greatly appreciated. Thanks, Myth.

(p.s. sorry for the wrong thread icon :))