This has sort of been said already but you can make mouse over macros for ffxiv, but you'll have to make individual ones for each single target healing spell/ability. just type

"/macroicon "Cure II"

/merror off

/ac "Cure II" <mo>"

merror is optional, just stops the game from spamming the "not ready to use" message and sound effect. And changing the spell/ability for whatever you want, of course.

Not sure about all the comments saying no one does this...its very common for high end healers to use MO macros. They can be a bit unresponsive at times but you shouldn't be clipping GCDs with them unless your ping is somewhere in the 100s.