By using rabcdasm I edited the .xml in quite a lot of ways.
I was able to make my cwhole shoot 20 projectiles at once and like 1000 shots per second.
They disconnect very fast though and very likely result in phantom enemies.
Tried changing a bunch of other thing in many other ways aswell but they all disconnect.
I also tried changing the slottype of items which theoretically should allow equiping heavy armor for wizard or even spells as weapons.
However when I changed the slottype of cwhole to spell one, I couldnt equip it anywhere.
Probably client checks the slottype first and then sends a request for the server, which then fails.
Only things that did work were editing the name, description and icon.
Those dont give any advantage in game though.
I only have one theoretical other method which probably wont work due to some other reasons.
Cant test it right now though.
I have lately been testing alot of things and trying to find any exploits I can.
Not a single one found yet.