Just gonna copy paste some of the suggestions I posted in the whine thread. Good on you for making a positive or rather potentially constructive thread, though.

1. Confession stacks on every 4-5th tick of Regen. Making it stack with the AoE Heals would most likely be too powerful.
2. The initial use of Regen and Medica 2, as well as using Medica and Cure 3 can also build up Lilies. So basically every GCD heal - this could be overkill though, so something in between might be more balanced.
3. The first offensive spell used while under the effect of Thin Air makes effected targets take more damage for 10 seconds, 10% for single target spells and 5% for AoE; or grant a damage buff to the whole party with the same concept.

Building on the things that are already there, instead of suggesting entirely new skills which just isn't gonna happen, even though something like Reflect would have been pretty neat.