I would swap Scribe Scroll for something else, merely because wizards do get it for free. I think pretty much every caster is going to have a metamagic feat by these kind of levels, so really it's only a 1-feat tax for wizards (who need the power the least).

Suggestions? Craft Staff. Skill Focus (Knowledge (Arcane)). Greater Spell Focus. Maybe Magical Aptitude, if you really want a tax.