Just for grins, why not "break" the swiki for a little while and see if the
problem user just goes away.  In other words, make the swiki behave
apparently normally but not actually make the requested changes.  Do this
for a week or so and see if the guy gets bored and moves on to something
else out of boredom or frustration.

Sort of like those car anti-theft systems that make it so the car either
won't start or poops out after only a mile or so.

Anybody truly interested in the system will come back.

-- Duane