So when you use the Transform/Deform options in the Face Key Editor everything works fine, you can move to different points on the timeline and animate facial features as you wish. The problem is that there are no key frames on the timeline or anything of the sort, so you can't edit your work, and more importantly, you can't manually key anything (you can't press V or use the "Insert Frame" button); this means that you can't extend frames (like if you want to hold a pose), move anything around, or copy/paste anything.
By extension of this issue, if you save a 1 frame animation that only has Transform/Deform data (from the Face Key Editor), you will get an error when trying to apply that animation; it still works, but you get an error saying "failed to load file." On top of that, even in longer animations, some data doesn't save properly; for instance, deformation data for my character's eyebrows won't save at all.
This is a pretty big deal for me, as I enjoy animating my characters this way, and I'd appreciate if solutions for this would be implemented at some point in the future.
Thank you.