If I knew it worked in 2.0, the look of the bar was customisable and it displayed the target of my heal rather than my current target, certainly. I know it's not a new idea, I'm just looking for a decent implementation.
With the death of my beloved Mash Mana Conserve looming, I'd pretty much kill for a decent overheal warner. Preferably a bar showing the current health of the person I'm casting my heal on - not my current target - with his projected health after I finish my cast and any overheal I cause overlayed. As I'm at work I don't have access to more than paint, and even that's not working well, but I tossed together two quick mock-ups to illustrate:
Target at 2k health. Heal adds 600 more, no overheal.
Target at 4k health. Heal adds 700, mostly red overheal extending beyond the regular bar.
'course, specific values used for text would preferably be customisable and all that, and, no, my paint skills are unlikely to go down in history :)
I know there's some addon that does this for sub 2.0 already, but it integrated into the casting bar which I dislike and as heal-cancel logic is trivial enough to currently macro the idea hasn't really interested me before. I'm not sure if this is still possible under 2.0, although I believe so as all I'm asking for is an info display rather than an actual unit frame. If anyone could confirm the inherent possibility or lack thereof, it'd be appreciated.