Pre-Patch is around the corner, and I hope this gets continued.

Couple of suggestions:

Unitframes

• Display Playerframe via Mouseover option.
• Instead of completely hiding the PlayerFrame add Opacity option.

Chat

• fade chat when mounted or flying option.

Micromenu

• movable Dungeon Finder Eye or anchor it to the Minimap without hiding it.
• #3

Tooltip

• add modifier option to display Tooltip during combat but hide it otherwise.

Actionbars

• mouseover ability for actionbars.
• #2

Data Panel

• displaying time, latency, fps, gold, durability (only 3 of those at the same time)

+1