wishlist: ability to specify different 'move node' behaviour

I would like the ability to configure Leo so the the 'move node' behaviour works is a different way than currently. This is by analogy with Ecco Pro, my (other! ;-) favourite outliner.

The diagrams below show how I would like this to work. A, C and D are sibling nodes. AA is a child of A

1) original state, with D selected

A
----AA
C
D <# selected

2) move node D up:

A
----AA
D <# selected
C

3) move node D up again:

D <# selected
A
----AA
C

ie. D moves from being 'directly below' A (and any child nodes, ie AA) to 'directly above' A

you can indent D at (2) if you want it to become the last child of A:

A
----AA
----D <# selected
C

and then continue as before.

    Thanks a lot
    Jon N