Are there plans to support RelativePanel soon (or done already)?

I found this older ticket for it that was targeting 3.1 but is still open so I'm assuming it didn't make it in.

https://www.noesisengine.com/bugs/view.php?id=2002

It is not yet implemented as it is something not so many people requested. I moved the target to 3.2 and we will implement it in one of the next minor versions.