Following desired changes are 10-19 only.
Warriors:
- Add Hamstring
- Add Interrupt
Rogues:
- Buff SS damage
- Crippling Poison
Hunters:
- Increased downtime on Conc Shot
- Remove Scatter Shot
- Remove Disengage
- Add Immo Trap
- Buff Melee Damage/Melee Abilities
Warlock:
- Add Curse of Ex
- Add Sacrifice
Druid:
- Buff Regrowth
- Swiftmend should not consume HoT
- Nerf Starsurge
- Thorns Internal Cooldown
- Move Catform speed buff to tier 3
Shamans:
- Buff Earthshield
- Add Healing Surge or Buff Wave
Paladin:
- Nerf PotI
- Lower HoJ durection
- Backscale low-level FoL like instant attacks
- Lower 3 point coefficient on Templar Strike
Mages:
- Buff Fire Spec
Priests:
- Backscale Flash Heal like Instant Attacks
These are all off the top of my head. I haven't played much since Cata because of a broken machine, but I think this would make the bracket feel a lot more like everything had a place and a role and would, in particular, make PuGs a lot more fun for everyone.