Code review comment for lp:~kissiel/checkbox/converged-keyboard-support

> Two issues with the first screens:
>
> 1. In addition to the continue button, you could also add a keyboard shortcut
> for the first screen "start testing"
>
> 2. The selection screens Alt+C does the right job but does not grey out the
> continue button.

Added both things.
Rebased on current trunk.