Assigning "Show folder content" to a mouse button or key.

I would like to know if it is possible to assign the "Show folder content" to a single key instead of having to right-click and then select it. Or at least have mouse hover act like tabbing (so that using a "/" would open the folder you are hovering with the mouse).

Maybe assigning "Show folder content" to middle mouse button or even a click with a modifier key (ctrl).

Using Cardapio AWN, latest version.
(Cardapio 0.9.185)