1. Keep Dispersion as 51pt Talent, Give it a Glyph to heal for as much mana it returns.
2. New 41 Pt talent.
For the next 20 seconds you deal 10% more damage with your shadow spells receive 100% extra healing from VE and you next fear will not break on damage.
Move VT to where VE is, make IMP VE baseline for VE and move VE to the side of VT as an optional talent.
Shadow affinity, if swp dispelled, make it like UA, but weaker and no silence, VT gives mana return and Devouring plague heals you for 100% of full duration of spell.
Fade makes u Immune to ALL cc for its duration, make fade only last 5 sec in PvP as opposed to PvE duration.
Reduced silence and stun time imbued into Imp Shadowform 10/20% on stuns 20/40% on Silences.(Imp shadow form needs a tooltip as big as shadowform, amrite?)
Psychic scream to 5/10sec off its untalented cooldown.
VE is a self buff, also reduces damage from critical strikes by 10%, not dispelable.
Any number of these changes will make shadow a better tree.