A new sorcerer tree is coming. Someone says it's Dragon Disciple, someone Acolyte of the Skin...
Anyway it seems that it will be more melee-oriented, or at least tougher. So here's my suggestion for a tier 5 enhancement:
Guttural Screams: When casting a spell [of your dragon color | of a school you have spell focus in | other restrictions], you outcry its magic formula from the deepest of yourself. The innatural power of your howls is such that you don't even need to perform specific moves to cast spells. Now you can cast [restricted] spells from your sorcerer's spell list while raged, silenced, paralized or lying on your back, and you ignore arcane spell failure. You're still unable to cast spells while unconscious, asleep, sapped, stunned or under similar effects.
I was thinking about melee synergy and flavour.