I would keep the shorter cast time on Benefic/Cure/Phsyick even with a trait the guaranteed a Crit. It seems fair if you are required to use a GCD on Regen/Aspected Ben/Aldo first and then it only applies to that one person in the party. Being able to weave more on WHM would be great and Astro still has their cards to contend with. SCH has always had tons of weaving room for abilities. I don't think giving healers a bit more power behind the low tier healing changes much at all in this way.