Two trees in dualview

Hello,

I configured a button with "Set tree=toggle" which opens/closes the foldertree. But this option only opens one tree. If I use dualmode (vert.) I would like to have two foldertrees.

I know I can use the listerviews, but it would be easier to turn on/off just the trees with one button/shortcut instead of "searching" and activating the actual used viewmode in the listerview.

Set tree=toggle,dual

Thank you very much.

That was my first idea, too, but I didn't try it because it's not mentioned in the manual (should be added; there's only "tree=toggle").