Using the charm pane bug, if you add enough charms to an item that the mouse-over description goes off-screen, it can cause the game to crash. A safer method of cheating would be to use iZakaroN's SaveEditor (or from Kiya's site, with description) and/or DAD's item editor.

You can also use the split stack exploit to duplicate restoration potions (unlimited healing almost makes your stats a non-issue, as long as you can do damage faster than your opponent can heal).
To get a lot more of stackable items, drag a stack out of (or into) your inventory (or container) and hold down the control key before dropping. This will bring up the split stack pane; type in a negative number and hit enter (the checkmark will be greyed out). This can also be done in the trade window.