Q 136 Do invocations count as SLA's?
Yes. They are explicitly SLAs, as stated (somewhere) in CArc.
Q139 Can I use Quicken SLA with Eldritch Blast then? If so, how would that work?
Q140 Okay, say I have CL 20, but only 16 levels of spellcasting (eg, a rainbow warsnake w/out text trumps table argument) If I take versatile spellcaster (or whatever that feat was that lets me combine two spell slots to make a spell slot 1 level higher), can I cast a 9th level spell?
Q141 If yes to the above, if I build sothat I get advanced learning at 20, can I use it to learn a 9th level evocation spell (Invoke Magic)