Reading over Versatile Spontaneity while trying to make a "spontaneous crafter" has sparked an interesting set of questions:
1) What characters can actually create spell books? Does it just require a Spellcraft check, or is having a casting mechanic based on book preparation needed to actually write one?
2) Can I use spells prepared through Versatile Spontaneity to craft magic items, thus lowering the inevitable +5 most spontaneous casters incur for making items?
This leads to the final question:
3) Can a spontaneous caster buy a scroll, scribe it into a spell book, prepare it through Versatile Spontaneity, and craft a Page of Spell Knowledge for the spell at a DC 22 instead of DC 27?
[EDIT: Effectively, through this method, a Sorcerer/Oracle/Ley-Line Guardian/etc. can BUY a new spell known. 1st = 535gp, 2nd = 2190gp, etc.]
If so, it's very possible to truly birth a spontaneous caster with access to LITERALLY every spell on their class spell list, as long as they can afford a large enough book. And this can start as early as Level 5.