Yes. Firstly, if I tell them to move somewhere, I want all healers to go all the way to that location. Currently a lot of healers go a lot of the way, but quite frequently they all just stay where they are (if part of a selection), or a few will stay back or stop walking somewhere on the way.
Unlike you I want my healers to move up to the target with the rest of the selection; if I didn't want that I'd not tell them to do that. If, for example, I want to capture a CC, I want these 'support' units to actually support my soldiers and heal them while they're at it. (Which also decreases the length of a 'healing session' after such an attack, which I feel can be quite lengthy even though I typically roll with ten healers.)
True, the healers might be shot at, but I do it in turtle speed anyway so I can micro healing if necessary.
Currently I just try to discipline them by repeating orders, which - thanks to ctlr groups - isn't that much of a pain.
I don't know if maybe their behavior according to their stances should also be adjusted, I didn't feel like 'aggressive' or 'defensive' had the effect I anticipated. (So 'stand ground' it is for me/them.)