Have you thought of adding a feature for password protection upon loading CF? I searched this section and could not find anything related to passwords...
I envisions something that is touchscreen friendly (A SIMPLE KEYPAD), and that is nicely integrated with CF, so that it 'looks right' in terms of coloring, font styles, button styles, etc.
The idea behind this would be to set CF as the default shell (WIndows launches directly into CF bypassing the windows explorer desktop), and user is presented with a password prompt.
Doesn't have to be bulletproof. Sounds like it is a very simple useful addition? One use: keep valet parkers from mocking around with your system.