As a Resto Druid I find it challenging to be able to locate dead bodies that need Battle Rezzing; especially in large raids. To combat that I was thinking of a process similar to this.
Select the Dead person in the grid interface.
An arrow comes up in centre of screen with directional information. This arrow will go brighter when you are in Range to cast Battle Rez.
Click the arrow to cast Battle Rez
p.s. My apologies if this is already an addon or if there is a third party tool that does similar. I had a quick search of the forum.