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It would be a useless feature to add that when a user/admin of the site does something really pathetic on the site (like poor use of image uploads that just really botches the site's appearance) that that logged in account loses either some randomly selected permission or, more advanced, some permission related to what they did to earn this admin-thrashing.
Improvement: auto-detect when a user botches layout in some way
caveat: auto-boot the site configurator who did not do his utmost to build the perfect imagecache configuration possible for the given situation