That exploit would work in the unpatched original release of the game. If you have installed the patch or have an already updated re-release version, then you can not open more than one charm pane.
You can use
DAD's item editor to add a bonus to equipment directly, though, or
iZakaroN's SaveEditor (also on
Kiya's site, with description) to give your character more stat, skill or experience points.
