Hello, thank you for the feedback! As Variable already said, it is already possible to quickly deselect everything, either by going to the Selection menu and clicking on Clear, or by pressing Control + D. Same thing with inverting the selection, either Selection > Invert, or Control + I. All of the shortcuts can be changed in the Preferences. We are working on the ability to rotate selections directly, but it still needs some time to make it work properly.
Can you clarify as to what do you mean by resizing the menus? Are you referring to window dialogs, panels, or something else?