This addon changes the behavior of Blizzard raid frames and is intended to be used by healers in RBG's (but are still Blizzard Raid Frames).

Only works with "keep groups together" disabled.

1) uses the spec icon instead of role icon while in a battleground (the adddon uses the batteground score to get spec information so outside a battleground it will show role icons) Role Icon will change to a gear if the player is inside a vehicle (like in Strand of the Ancients)
2) darker out of range frames (so you have a more clear view of who is in range and who is not)
3) ignores right clicks after the battleground begins, so you can turn with the mouse over the frames
4) server names removed
5) direction and distance of out of range units when mouseover
6) bigger CC debuffs (set to show only dispelable debuffs in the standard raid frames UI options to only show dispelable debuffs with this addon as well)

I highly recommend you to order the frames by function (role) instead of by group so the flag carrier and the other healers are in the top left (this is done in default Blizzard raid frames configuration)
I also recommend to use a 5 row 2 columns layout so you reduce the mouse travel time (near square aspect ratio)

In addition to my own code, this addon incorporates (meaning it is already included) the code of BigDebuffs by Jordons (version 1.6 which was released in a public domain licence)