Inline with what most people are talking about in regards to customization, I thought it was awesome when Brewmaster monks could walk with their staff on shoulder. I think it would be GREAT if casters could check a box somewhere in the UI to hold their weapon/stave while casting. I also think it makes sense that any character walking with their stave held in-hand, would not walk with it parallel to the ground, rather as one would walk with a stave in real life, perpendicular to the ground and touching the ground (like gandalf).
I also think it would be the bees knees if there was more customization among:
- Druid forms
- Death Knight pets
- Shaman Elementals
- Demon-hunters wings being out when not gliding
- Monk Combat animations
- (Someone else went in-depth here Suggestions for changes in animations for monks)
- Visible trinkets,
- Skulls, trophies, books, etc. Displayed maybe around the belt, and collar.