@Rodrigo Whoa, that was a warm greeting and a very helpful answer, thanks!
My use case is tweening URLs on the whole site. Every page is assembled and disassembled in its own way, it's not just uniform crossfades. This is how the end result should look like and this is the repository I'm working on.
I'm still figuring out how to do this; should I use a single timeline, or multiple timelines, or multiple timelines on a single timeline... Any suggestions on how you would approach this are kindly welcome.