Don't really see how it would help, though. I'd imagine that if you are out of range of the mob, you are also out of range of the tank, and thus you are unable to heal them. If that's not a problem, the pull isn't difficult enough to need the pre-regen/medica 2. If it IS a problem, well, your tank is now in danger and you are unable to assist.

I'm not saying this to discourage you - stuff like this is often what we springboard off of to find neat strategies and tricks we can do - but I don't see the use of it AS IS.