New spellcasters

[Valgav]

I'm back to nwn after few years. And my first question is the old one:

Is there any easy way add custom spellcaster class?

I first saw that on polish server named Chult like 4 years ago. Assassin was override and has additional column in spells.2da. So is there any easy way to do that? (Ofc remebering spells was through dialog not gui but Ass can have his own spellbook)

I still have all the client side files from that server (exe extension and haks) but i don't have knowledge how to recreate that effect. Any chance that it's already solved?