Thanks for the feedback.
I think this fundamentally boils down to a simple copy and paste with animations. If you're copying all the elements, that is effectively copying a whole scene (and feel free to remove extraneous timelines). If you're just wanting to copy a timeline, and it happens to be the main timeline (or a timeline with an identical name), it raises ambiguous questions such as do those animations get merged or put on a new timeline in the other scene?
Thus selecting elements and pasting with animations will get all elements and their animations for one timeline; they will then go on the selected timeline which you could've quickly made as a new one.
The hack some users have come up with is to 'Edit > Edit Element's Inner HTML' and then hit escape. However do note that even if the element is ordered below, when you select an element from the timeline, any clicks on the element in the scene area will keep that element selected even if it is below other elements. There's even a couple pixels of slop to make sure it isn't accidentally moved.