Ok, I intend to get the upcoming supplement for this system, which is supposed to have sanity rules in it. As far as the meantime goes, the core system is almost entirely the same as Chaosium Basic Role Playing, (Chthulu, Stormbringer, etc.). So it stands to reason the sanity rules will be somewhat similar when they are published. Which means to get the Sanity stat we will go with the characters Power x 5.
If a character loses 5 or more San they they go temporarily insane.
If they lose 1/5 their total in one hour then they go indefinitely insane.
I will roll randomly and inflict some sort of madness on you. Heh.