To be able to move layers (and groups) in and out of layer groups. In order to attach/detach to and from a parent container.
For instance, if I design a few element and later decide to add hover interaction, I will need to add a container to handle the interaction.
Currently there is no way of attaching elements that were previously on the page to a newly added container in this fashion.
The only way to attach them is to move them around, which might be unwanted after they were already carefully placed where they currently are.
Same goes for detaching, which is even worse since you have to make a huge mess of the page when you want to delete a container and keep its content.
So please add a way to do these operations from the layers panel.
Hey @sabugen Good news 
A new feature is open now that creates a container around selected elements.
Simply select / multi-select any element, and you have 3 entry points:
1) In the floating panel (when Stack is not available):
2) Context menu - right-click, layers panel:
3) Keyboard shortcut (option C)
Enjoy
p.s.
and you can also remove container in the same way!
yeah I’m already using it, it’s an amazing feature, extremely convenient, good job!