So... Password protection is coming! When? As soon as I stop playing TF2 and spend a couple hours on it.
As far as implementation details goes, I'm thinking that to enable it you will crreate a file named "lock-enable.txt" in /usr/share/backupmenu/. If you leave the contents blank, it will validate against the encrypted root password in /etc/passwd, allowing for easy changes. Alternately, you'll be able to put a password hash in the lock-enable file, and it will use that instead - I'll have to figure out a command for /creating/ such a hash, though. Probably something with "openssl passwd...".

As far as other things...
1. In the process of doing the above, I'll make a generic text-entry function which can be used later. This could easily be used for a better run-command box.
2. ext2-4 modules are now copied by default; I'll have to figure out a way to autodetect the correct one to mount if I want support for anternate filesystems for mydocs/sd/opt.
3. mkfs.ext* support for reformatting the optfs should be doable, I'll just have to add an option for it.

Oh, this brings me to another problem: Is there a good way to do an "include" of shell-script code in another file such that I can use pre-defined variables inside it? My main program file's getting big and complicated, and I'd like to just move chunks into their own files.

edit: Missed a post!
@gabby131:
Uh, yes and no. You can use it if you want; It's a free world. But I doubt it'll work for you - That's tuned to be exactly right for /my/ sample, which won't be the same as yours.
What you want to do is - for each frequency - lock your n900 to that frequency, play a video via mplayer; something that will max out the cpu. If it plays, change the voltage down 1 # and repeat the test. Keep going down until the system crashes or you get decoding errors, then take that value and add two to it. That should be the minimum stable voltage for that frequency.
If you get crashes at a particular frequency later, up the voltage another 1 or 2 if it still has issues.
I'll take an hour or so to calibrate for all frequencys, but it's nice to have no instability.