Fair warning; these suggestions are mainly to help out divines or backup healers such as Bards.
1) Allow us to move individual vitals bars. This can be useful to segregate Pale Masters or self-healers and to give certain members priority of others based on their position (the main tank is first, DPS second, casters third, etc)
2) Allow us to customize hotkeys for members. Again, this will help with priorities. Instead of having the main tank be F5, make him F2. This also means that healers won't have to memorize what role is assigned to what hotkey for every group.