As is stated by the title, can the caster of a spell increase the time it takes to cast? ie can a caster purposfully slow down the casting of a swift spell to a standard action incurring all penalties to do so. (ie spell now provokes AoO's as any standard action spell would.)
I can't find a reason why this can't be done? It's just a caster going back to basics of the days they were first learning to cast in the safty of a school.