Reduce the cooldown of Mass Dispel to 10 seconds and the mana cost down from 13% base.
Increase the cooldown on Spectral Guise and increase its effectiveness as a defensive ability. Maybe a certain amount of time in which the stealth cannot be broken 2-3 seconds.
Make the silence immunity of Inner Focus a part of the spell by default instead of having a glyph. The glyphs for mass dispel, desperation, sw:d, and inner focus are all very important to disc PvP and you will be missing one currently.
Reduce the cooldown of Void Shift to 4 minutes. Currently it is at 6 which makes it a longer cd than divine shield... I do like void shift but the cooldown is painfully long.
I would love to hear what you all think of my proposed changes. Post what you think or any ideas you would like to see changed for Disc PvP.