Relevel script has been proposed before (by me) and has been turned down for a somewhat decent reason.Thorsson wrote: Well if you can re-level all the way, all you are stuck with is your creation stats/race/alignment/class, but it DOES stop the abuses I can think of. I think this a very good suggestion.
It is very easy to exploit, because during releveling process wizards retain bonus spells they learned before. So, you can just relevel 20 times or so and learn everything there is about magic. RCR does not have this problem. Obviously that can be fixed by adding a checklist that would define characters that can or cannot be releveled, but nobody seemed to be in the mood for doing that.
Re-leveling certain other classes can also mess up character badly, for example I remember having problems with eldritch blast dice when deleveling/releveling hellfire warlock. Basically, you can lose eldritch blast completely competely during delevel. It that happens only DM will be able to fix it.
P.S. Have impression that you're using very unorthodox defintiion of "abuse".