Assign Volunteer to Manage Themes?

[Ocean West]

Is there a true fire way to open the system ACP up enough to only give one group or assigned individuals ability to ONLY customize themes?  

[Nathan Explosion]

Create a new Administrator group/member, disable everything other than System (ie toggle the 'Grant access to....' option off) and then go back to System and toggle off everything except the options under Appearance -> Themes