You cannot edit alot in-game, though you can packet edit quite a bit once you decrypt them from the server.
You can also make an ultimate character just by enabling the button for it and doing a few thing's in memory so the server does accept it ( took a long time to figure out )
You can remove the censor's on creation of your character and remove it so you can have ascii in your name aswell.
You can edit ( if nobody is around you ) monster pathing to path toward's you in game ( a kind of vac, but not exactly ) , if people come around they will dissapear however..
You cannot modify your movement speed to an excessive amount like you used to be able to if you removed the reset the client would make on your character, i minorly released that before and it was patched quite fast aswell as my youtube video Roadrunner was removed because aeria protested against it to the youtube admin's
You can access shop's and npc's on the same map including your storage.
You cannot go into the enemy's newbie area anymore by changing portal direction/location and changing triggers in the client.
You cannot modify crit/damage/hit success.
You can modify your range of your character.
You can create a type of 'miss' godmode, but i have never been able to successfully make it work with magic, and only with melee ( confusing and took a month to even make it work for melee, very long script due to each monster has a unique npcID )
You used to, but cannot anymore, buy from people's shop's without money ( closed beta ).
Bout all i can think of off had.