So, it's a way to get more skill points, in a setting where you're already bogged down with more Skill Books than you know what to do with?
and just exactly how did Hassat figure this out? did he unequip some items and realize "hey, the points are still there?"
anywho, from whom do you get the "Summon Demon" skillpoint?
Laeniel. An enemy you fight during the storyline drops the key to his room.
He discovered it becase he had Summon Demon-boosting jewelry and noticed he gained a ton of points from the mindread, far more than just the +1 it says it gives.
As for the skill points availabe, I can think of plenty to do with them. There seem to be 42 total points available from this (on top of the 6 available by default). 43, if you kept Jagon's Necklace from Broken Valley instead of completing that bounty quest.