I've got so far my drag'n drop indicating where the items will be dropped:
However, i have the same operations available through keyboard shortcuts, ie: ALT + Arrow-Keys. But the keyboard variant works directly, not showing any preview and it also doesn't allow you to move items in a collapsed tree node.
So, should I show the same preview as in the mouse based version and allow the user also to expand tree nodes ?
What do you think ?
ps: i am interested in how this should work for people with no mouse.