Using flyinside XP Pro 1.71 and the latest X-Plane 11 beta (b6) I am able to click with my mapped "activate" button to see the menus at the top of the sim, and I can even drop those menus down, but for example, if I click to dropdown the plugins menu, I am not able to then expand any of those menus.
another thing I would love to be able to do is click and hold, so if you wanted to click and drag a scroll bar or something inside some of the menus (like for example you are changing the time of day, or want to drag and slide a window or map around or something).