Fair enough.
Ok, question: Pin or Password?
I figure I've got three options:
1. Input pin using the top row of keys. This would be very simple to do, and very quick to enter.
2. Input pin through the use of arrow keys and enter: A "menu" with all ten numbers in a grid, and you have to move the cursor around and press enter to select each. This would be slightly harder to implement, but would also provide some time-security: each key attempt would take a good ten seconds, at least.
3. Password using the full keyboard. Code would be about the same as #2, but you wouldn't be able to do a key "combination" like shift+x - You would have to press shift, release it, then press x.

Also, should I use the OS pin(in the case of #1 & 2), the root PW(in the case of #3), or a -different- password/pin?