There's nothing in sudo to give the new user X permissions, so I wouldn't expect this to work. gksudo and kdesu should work, however kdesu can't be restricted by application because it goes through kdesu_stub so it needs sudoers acces to that which gives access to all applications.
-- regular user can't start admin application with sudo as specified in sudoers https://launchpad.net/bugs/92401 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
