As I understand it the spell casting skills for pure casters who change to hybrids are locked just like skills that no longer apply to their new profession. Effectively, they don't count as spell casters (no reading from books or increasing skills).
Power cast must be a special case since it's an expert skill and its only requirement is to have Int 100. I agree that this type of class-changing isn't worth it if you're looking to really boost your spell casting. I often do it with a Mage to Sam or Psionic to Monk just to allow the characters to use some of the late game armours and weapons and it means if they make it to level 5 they can learn the last few spells from their book.
xfactor
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