Double click in fast menu

It´s Millimeter work to navigate through the fast menu. Now the content of a folder shows by pulling the mouse across the arrow and the folder opens by a single click.
I would love to have an option so that the content of the folder shows by a single click and the folder opens with a double click.
Very small change, but it would make it much more comfortable for me.

Thank you for the suggestion. I’m thinking of adding mouse middle and right click support in Listary 4. Double click seems impossible because the first left click will invoke the menu command immediately.