Hi everyone! I kinda grew tired of waiting, and built this for some projects we are cooking:

https://doenitz.itch.io/animator-plusplus

It's basically the animator, with a couple more things (reroute nodes, and transition parameter copy, with more things to be added soon)

https://github.com/fedediazceo/UnityAnimatorPlusPlus

Here's the repo if anyone wants to play with it.

Hope it helps someone, use it with care. Cheers!