I don't think SE will affort any kind of DPS rotation for healer, as if GCD heal are poorly used at high level of gameplay, oGCD heal are all used and optimized. Having a decent DPS rotation would need more skill dedicated to DPS what would eat some space for healing oGCD. And it would also make the rôle scarier for new players.

However, what would be nice i think is to have a better implication on group burst phase outside raid buff they get. WHM also already have presence of mind and afflatus misery, others could get something too.