Robert,
Thank you very much for posting information on roasting cashews.
I just bought a pound of organic, raw whole cashews ($8) and I am going to roast them with no salt or oil.
If you do use oil, I suggest coconut oil. It and butter are the only two cooking oils that, under heat, do not break down into transfats. Preferably organic butter, of course.
Also, the extra virgin coconut oil is more expensive and does taste like coconut. Whereas coconut oil that is not extra virgin has little taste of the coconut. So I would avoid extra virgin in this case.
Because I like the taste of the cashew.