Iriel's DoubleWide I believe does just this, and nothing else. (It is a shame that so many mods designed for a single purpose need to stick in lots of other shit, like EQL for example, which I love using save for some unnecessary options.)
You could call it applying the AceConfig design to fubar/titan if you want, but that's not really a great way to say it... you'll confuse people.
We're just looking into uncoupling the data addon (PerformanceFu) from the display addon (FuBar). Make the data addon completely independent, and the display addon (FuBar, Titan, whatever) pull it's data and display it. While it doesn't quite make sense when you think of all the plugins specifically designed for Fu, it makes a lot of sense for addons that use Fu as a secondary interface...
Love the idea. The possibilities are endless. With front-ends addons like FuBar and Titan, and other addons for minimap buttons and free panels (like SL*) and stuff utilizing this, this could be simply amazing for the end-user, and make implementing things easier for the coder.