I wouldn't mind having Haste-ga JA-spell for whm ^^', and a way to erase-na spells with landing cure, Cure(ga) 6, are the one that i almost never use, we got too much healing power that my only spells are Cure III-IV, rarely V, and Curaga III/IV.
Being able to cast erase-na spells after a cure without waiting the casting has end (the bar) would be great too.