Your not making this up, It was a thing lol. Cant remember the detail - but I think your pretty close.. I had a friend with some whacky SSW with stupid stats on it (impossible).. never tried it though, seemed to risky and obvious lol.
The NPC exploits was pretty bad, you could literally milk quest rewards indefinatley, that included: gold, items, benes, exp (level 50 boots quest gave exp pills) etc.. just by recrafting and resending the [@getreward] call - euro mir didnt always have checks on the same NPC actions, doh.
The Challenge room NPC was funny too, you could spawn tonnes of mobs, firewall the room and level quite fast lol. (Flood the [@spawnmobs] packet)
You could also change the cast location of some of the skills through packet editing, for example cast icestorm on the EM body while stood at the enterance. Also in town PK areas, you could cast curse on an area thats off screen for the tao and the skill wouldnt visually appear for anyone, but people would get the affects and randomly get poisioned. funny hahaha
Game was flooded with exploits really :X