I have given some of the same feedback myself. I think the most important on this list is 6. If I am understanding that request right, you basically want Sub submenus to create a dropdown menu within a dropdown menu. This is very basic functionality that is needed on alot of websites and from what I have heard and the updates they have been making to the menu system, it seems like we are on the path to getting that.
#3 is another big one in my opinion. The Corvid workaround is sloppy and doesnt provide a smooth way to have the menu shrink and grow. Thats actually part of the problem with the current FAQ app. The animation for opening a question is extremely harsh and forces content down the page rather than smoothly sliding in and gently pushing content down.