Hotkeys should be working. Click on the little circles below the buttons to change sets or hold shift+right/left arrowkey on keyboard, then right click on a button. A window should popup allowing you to edit them. First box is for the name that will be displayed on the button and the second is the command. It won't work on the first set though. Then you can either click on the button or press F1,2,3 etc on the keyboard.
Would be great to see a few more people on trying stuff out, the more the merrier! Still lacking things atm, so not a whole lot to do, but it's starting to get there.