Ok no problem. Thanks for the interest!
Updated the build, due to an error Garryl pointed out. I wound up taking Spellthief at 1st level after all. Yay for skill points!
If I go Focused Specialist, and take Uncanny Forethought, can I leave my bonus specialist spell slots open and use them to cast any spell with Uncanny Forethought? Or do I have to use my general spell slots for that? If I can't, I will go just normal generalist or normal diviner specialist.
Well just RAW it looks like it only applies to bonus spells specifically from your Intelligence bonus. How many bonus specialist slots do you have?
The way the feat works is that you can leave a number of slots equal to your intelligence modifier empty, and later spontaneously cast either a mastered spell (as a standard action) or any spell you know (full-round action) out of those slots.
(The fluff of this is that you're so smart that you actually prepared the spell you cast, I guess. I'm going to say he has a 6th sense from being a divination specialist that lets him do this.)
My question was what are the limitations on which slots I can leave open to use with this? Can they be my specialist wizard slots, which normally can only be used to prepare spells from my specialty school? If so, can I still use them to cast any spell? Or does the spell I cast spontaneously still have to be from my specialist school?
If I go with a normal specialist, I'd only have 1 specialist spell slot per spell level. If I went with a Focused Specialist, I'd have 3 specialist slots per spell level. I'd still be limited to a number of slots equal to my Int mod to leave open for use with the feat. I'm just curious which slots I could use for this, and if the specialist restriction would still apply...
I really shouldn't have even asked this question. If I were the DM, I'd say that if you used specialist slots for this that you'd still be restricted to casting spells from your specialist school with them. I had another DM rule that I could use them to cast anything, though, which is why I asked.
I'll go with the more conservative assumption for this game, since you asked us to keep it to moderate optimization. So I'll just be playing a normal specialist (diviner), instead of a focused specialist. And I'll assume that I can only use my specialist slots for divination spells, even if I leave them empty for use with Uncanny Forethought.