Creating a "Clean" user profile on a CFW PS3?

I'm in the middle of setting up a PS3 with custom firmware for a friend. (4.88 Evilnat)

I'm looking to see if I can lock all the CFW settings and such to a "CFW Settings" user profile, and leave the main user profile just with the games. A very stock-looking experience with the CFW settings and such locked, so my friend, (or her young son) won't accidentally change something.

I hope I'm communicating that effectively.
Any help would be appreciated!
Thanks!