Maveric and Chris Mahan have both suggested formulas for blocking signed-in users from editing, if abandon cooperative editing and engage in excessive reversion.
I agree in principle, and I trust someone like mav or Eloquence or Angelas or (oddly enough, even myself) to: 1. Determine that someone has violated the rules 2. Recommend a ban to Jimbo
I just don't think Jimbo is *ever* going to delegate hard-ban authority, even for a week -- not any time soon, anyway. He's found a way of maintaining community stability and he's not likely to give in to our periodic demands for "more authority".
Sometimes I think he's just being stubborn, and sometimes I think he's much wiser than I am about this - but /he/ is the one running a successful company and sponsoring the world's largest Wiki community (not little ol' me).
Uncle Ed