The console-UI idea of switching menus by using Q/E (or A/D, or anything) makes no sense on a PC. If I see a menu option, I try to click it. I am constantly confounded by the menus because you can see a preview of what's on the next "tab" but you cannot click that next tab. I have to go back and click the tab I'm on for some reason. It's very confusing.
In general: you should never have to use keyboard commands to navigate anything on PC - just click. The mouse is your primary input device. Having shortcuts is fine, but clicking should be the main way to do things.
Also, please allow for faster scrolling, and more obvious scroll bars on the side of long menus so I can more easily grab them and pull them down.