Healers need an overhaul

[Seraphor]

I think another thing healer can benefit double targeting.. you can target boss (or mob) and a group member at same time.

Any offensive spell you use cast to boss.. any beneficial spell you use cast to selected party member.

It makes DPS rotation (they don't have any yet) much more easier. It can be included in targeting options as optional choice.

Focus Target.
But I guess what you're saying, there should be an opinion, or default function, that if the spell/skill you're using isn't applicable to your target, then it will attempt to use it on your Focus Target instead. That would save macroing skills to get this effect.
I currently (for every healer except Sage who I'm learning not to do this with) have macro'd all my healer dps skills to target-of-target, so I hard target the tank (focus target boss for info) and then heals hit the tank and dps hits target-of-target aka the boss.