I manually control both fairies and for Selene I keep both speed buffs macroed to the same button. That way which ever is not on CD will fire. This requires you to hit that button every 30sec to keep the buffs up, but it becomes a rhythm... reminds me of bards in other games in a way.

Fairies being manually controlled to embrace is much more efficient than them casting it all willy nilly. Not only do they cast the heals faster if forced, but you can use them to heal people above the break point of when they would actually heal them themselves. In addition, a roused fairy casting embrace while you heal a tank can split your healing quite effectively when needed.