As the title says. It's deeply, utterly frustrating the way it is now. Try rezzing someone? By the third attempt the game actually registers it as targetting the guy on the ground, they are either dead, rezzed by a non-healing class, or you are dead yourself.
A new button is unlikely due to consoles. But something needs to be done to make it easier to target allies.
I think they just need to improve the detection of downed allies when you are trying to pick them up as apothecary. Everyone who plays space marine knows the pain of healing yourself constantly until you can finally pick the dude off the ground. It is all down to hit detection on the player model on the ground
I've heard this argument before. Just make it three buttons then. The current combined one, a dedicated button to use it on yourself, a dedicated button to use it on others.
Once again, consoles ruin the day. To be honest though, the game could use a complete control scheme rework, not just fixing a function or two.
There is a fix on the way for this, should be next patch as it's fixed internally. The detection was neutered because we had the opposite problem for a long time where you could rarely apply a self-heal if there was an ally anywhere near you. Next version is the middle ground. Regardless I'd gladly take a ctrl/shift/alt modifier for self-targeting all healing and kit applications.