My goal is to show the root menu on ButtonPress, and execute the menu item on ButtonRelease -- in a single click. My configuration shows the root menu on ButtonPress, and the menu Exec is set to ButtonRelease. Moving the mouse over menu items with the mouse button still pressed down doesn't select the item, and releasing the button doesn't execute. I have to release and click a second time for it to work.
This has now been added to git head, to enable add this change the following under the Menu section in the main configuration file:
Select = "Motion MotionPressed" Enter = "ButtonPress MotionPressed"