So I would think with Repeater regions and Vuhdo you could assign a different group in vuhdo to a different healer using regions and so effectively heal a raid. The only issue would be that you could not help across groups, i.e. if one group is getting owned you cannot help with a second healer, altough I could think of some workarounds which might work for that too.
Another way would be using modifiers on your spells which would use certain healer using say alt plus the normal heal and this will cast for that healer.
Lots of possibilities I would think