The questions you provided are definetely important, let's hope chip will find his way into this thread and shed some light on them
Concerning the problem with AuraMastery:
I forgot to include custom durations into the "player only" statement. If you enter the lockout ability id for the shard/orbs lockout, everything works fine, until you enter a custom duration for it. As soon as a custom duration is set by the player, the aura will trigger by combat events from ALL player characters around you, not only those triggered by the player himself. I just fixed it locally, next major release shouldnt be far away.
In a future build i will implement a field where ppl can enter something like "check for specific source unit", to filter bosses and other units out.