I spoke with one of our Sr Programmers about it some more. He told me it’s “mostly a matter of plumbing”:
"Components are special in our hierarchy, in that they’re Objects, but they inherit a bit of functionality from Actor.
"Timelines are components, and can now be added to other components, but this isn’t set up in Blueprints yet. It’s a matter of making sure that two different attachment / ownership paths (actors owning components, and components owning other components) both work.
"second part of issue is that components aren’t ticked same way that Actors are: they get their tick from their parent. So, we’ll have to do a bit more plumbing to make that work.
"Not that any of this is impossible, it just needs a bit of reworking to make it happen.
“As a workaround, he could use component’s tick function to manipulate it’s parent function per-frame to same end. He just won’t have nice curve editing tool in timeline unless he uses an external curve.”