It would be practical for shaman grow / shrink spells to have an effect icon so they may be clicked off when they are no longer needed (you can't climb on some things after you've been shrunk).
I'ld rather have a command to cancel shrink/grow than waste a slot. It's not hard to fill all 15 spell slots, and if you consider that you must leave some free slots for enemy debuffs/dots, every extra slot I can get is always welcome.
