Extra features for the raid window

[Eloora]

I have a feeling this isn't possible but I promised a guildie I'd ask for this here.

As a healer on a raid it is sometimes hard to see when someone outside of your group needs a heal. Plus the raid window is so big and obtrusive it's a pain to have blocking your screen.
What he would like is to have the raid window completely faded (invisible) untill someone's health gets low (let's say 50% and under). At that point the raid window or the group(s) containing the injured persons would return to view. Maybe the names/bars could light up or flash, or in some way become more prominent to increase visibility for whoever needs a heal.

Any of this doable?

Thanks,