Velo,

What I've found after leveling my tank to 26 is that during most FATEs it is either 1 large boss to kill or a swarm of small things without a lot in between. When it's the one mob, very soon a tank (or pet) will establish threat making them the primary target so that it's easy to target the boss then click on the name of the PC the boss has targeted to get the heals off; with the multi-mob thing....I honestly haven't found anything that works well for healing everyone besides just trying to keep my eyes open when healing.

All that aside though, I'm not sure SE would add what you're discussing seeing as it would make it too easy to heal the critically low members by simply clicking 2 or 3 keys on the keyboard and would take the challenge out of healing, imo. That said, hopefully they come up with something so that in larger groupings of players (without being an actual group) there is some way to help make sure that the squishy caster doesn't end up dead because of AoE aggro.