Sorry for the delayed reply. Sometimes when I read everyone's comments, I don't respond right-a-way and therefore forget about what I just read. lol.
Anyway, I like the idea. I will keep it in mind for a future plugin.
So how about this idea? I know its kinda old and hasn't been looked at in sometime, but I actually went to the WoWAce forums and requested a similiar addon... Very fortunately I a forum moderator and author for WoWAce made me an addon that is similiar to this feature, but its incomplete and full of bugs...
This is what the addon currently looks like

Also here is a direct link to the thread that dicusses the addon, its requested features and etc...
WoWAce Forums
I am now bringing the idea here, because not only are there obviously others out there that would like to see this feature put into play, but obviously there are authors (Pazza included) that would like to write this addon//plugin
Honestly, the addon that I have currently made for this feature is working fine and well, but in all truths, there aren't that many features, many more could be listed, and the current addon Errors as soon as you load the game... It works every single time when you do a /console reloadui after already being in the game, and it seems to be a little slow, but it definitely works..