If you have intelligence of 8 (or higher) then I would recommend using the withcraft school, oath of desecration is completely insane. Infact with an intelligence of 8 (or higher) I would highly recommend atleast 1 point in every school just for all the great low level spells.
With regards to your crafting and witchcraft question, I do not fully understand. If your desired answer is not present then please ask it again.
As far as crafting goes, witchcraft does not interfere with crafting, however magic unlock is only craftable on scroll since there are no books for it. Personally crafting witchcraft scrolls is pretty great as you can get oath, drain willpower, magic unlock, absorb elements and many more great scrolls like invulnerability.
With kind regards,
Rashar.
