It would be great if it was possible to marquee deselect controls (with shift or control, for example) in Animation Mode as easily as marquee selecting them. When the Animator works, it slows the work down when they need to deselect the controls one by one.
This is one of most requested features amongst the Animators.
Unfortunately, I don’t have a timeline for the change. One of the best things to do is watch the mainline github to see if it comes in, and as it does you can see how difficult it might be to cherry pick it.
This will be included in a future release, not as a backport to the current release. As it comes in, you could attempt to cherry-pick the change, but without knowing the implementation or what it could be tied to in terms of other work, I wouldn’t know how feasible that would be until it’s been done.