No luck so far, i tried to make the changes(and tried some others) by extracting the script files from PRC haks and changing the data, then replacing the old file in the haks with the new one, this worked with 2das to change pnp shifter requirements but didnt affect the shifting epic power gain in any way, either i dont know how to change it properly or the game doesnt want to read the changed nss files in prc_include.hak
Update: i got it working, looks like a lot of the checking for the epic shifting is made in the ingame shifter options conversation script, which checks if the user is an epic shifter. I will explore now if its possible to turn shifter into a base class, so you could go pure shifter, might be a big change to do though but i'll start at investigating the 2da's.
Update 2: looks like turning shifterpnp into a base class type was really easy through the 2da's now i'm off to try if i can succeed with a pure shifter pnp character.