I would like to see in a next xenforo2 standard style:
1. off canvas menu
2. off canvas sidebar
but more than that:
Off canvas menu and sidebar together in a single column... how? With tabs!
For example take a look at this:
Resize your browser and click on the hamburger menu... as you can see with a single off canvas menu combined with tabs you can have a single menu button with different off canvas menus.