I've not seen any mouse-over healing addons ever, except in VuhDo I think. Someone -could- technically write you an AddOn for it, but not sure who would do that when you can already create it ten times easier with a macro, wich also wouldnt need to be updated when patches arrive.
But it's up to you of course, you could always try VuhDo if you are okay with new raidframes.
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