Feature Request: swap vertical & horizontal thumbnail previews

Don't if this is possible but I'd like to see an option whereby it is possible to swap the orientation of the thumbnail windows so a vertical taskbar shows a horizontal thumbnail window.

So for instance if in vertical taskbar mode and you hover over a group, the thumbnails window pops up, as if the taskbar was in horizontal mode, across the screen.

I'm gonna donate in any event as this tools has features iv'e been looking for, for years.  MIDDLE CLICK CLOSE YES!