Copying layers/groups to other documents
What’s keeping you from doing that?
Admittedly having to drag from the Canvas instead the Layers Panel, the delay before the other doc gets focus and then having to move in is a drag – but then I don’t like Tabs anyway.
»Send to« (or rather something close to that) should be Script-able and the Script could be invoked with a Keyboard Shortcut.
I want to simply right-click on any layer, group, selected layers, or linked layers and in the right click menu, there should be a "send to" option. The send to should have a tree of the current groups.
Have you ever had time to check out the test-Script in the private message I sent you?
You can "send" layers & groups to another document with duplicate to the target document. Simply right-click the source layers in the Layers panel, choose Duplicate Layer...
and in Destination, select the target document. No un-docking and dragging.