What? The mouse is a convenient but horribly inefficient tool. There are text editors made for professional programmers that can be used 100% without a mouse, all through keyboard shortcuts, because it's much more efficient.
Only Grognards program entirely without the mouse.
Anyhow the point here is really that when it comes to getting things done, the scale looks something like this
Keyboard shortcuts > Mouse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> WASD navigation
There are probably worse ways you can design a menu then WASD navigation only, but you'd really have to try hard.