Password protection of LW settings would be a very inefficient and ineffective way to filter porn, since so much junk isn't labelled "porn".

I've two kids also, and they have to be taught to use to internet responsibly, since there is so much out there (not just through LW). I'd be irresponsible if I depended on a password to do my parenting.

Still, if pw protection of the prefs could be easily done, it's a nice token gesture.