Sorcerers already have Knowledge (Arcana) as a class skill...
@anybody promoting more flavor, more of a theme: this is exactly what I'd want to see even less of. Dragonblood is all well and good, but what I love about the Sorcerer is that the class is almost pure mechanics (and a good one at that), no handy-dandy fluff tacked on that a PC might need shoehorning into later.
You want a powerful enchanter, who breaks others' will almost without trying? Sorcerer can do that, just load him with Sleep (later switched out), Suggestion, Gentle Reminder, Charm Monster and Magic Jar. You still got room for buffs, some utility, some pure offense, AND you're extremely good at spontaneously choosing what kind of twist you want to give that town guard's/princess's/Orc chieftain's/Bone Devil's mind.
Likewise for fire-themed blaster, support buffer, ship mage, illusionist/con artist, necromancy-themed debuffer etc.
Your spell selection is your flavor - just choosing two or three spells of a particular school or theme will ensure that this is what your PC will be famous for and associated with. What's more, just choosing two or three spells still leaves plenty of space for your more generic "everybody needs to know" spells.
I don't think lack of flavor is a fault in a class - it's a boon to the creative player!