It' s almost unbelievable that a so simpl thing get too many posts.
Dude, everyone can do this stuff and you had many answers telling the way to do.
There's an option in a menu I don't remeber now (maybe Options/Preferences) that alows to input negative and/or huge amount of numbers and there's the shift + double click trick.
Quite simple.
Is your World Editor from Reign of Chaos or some other old version? Is your software genuine?
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.