I would love to be able to learn a Transmutation Specialist skill that would allow me to reduce the energy cost for one type of transmuting. For example, I do a lot of fruit changing so I would choose to be a fruit transmutator specialist. Maybe it could cut energy cost by 1/3? If you wanted to change your specialty you would need to re-learn the skill.
Alternatively, I'd really like a potion that eliminated the energy cost of transmuting for a period of time, kind of like the Earthshaker. Thoughts?