Mouse wheel minimize/restore all group items

It seems like the current option "Minimize/restore when mouse is over" - "Taskbar buttons" does nothing when windows are grouped.  Can you make is so that this will minimize/restores all group items.

I am not sure if this makes a difference, but the window group is originating from a pinned button.  

My current workarounds are:

a. Right clicking the group and hitting: "Restore all windows"/"Minimize all windows"

b. taskbaritem|x1click 12,  taskbaritem|x2click 

But using the mouse wheel would be nice, since that is the behavior for non grouped buttons.