perhaps i could use that as a screensaver password to share with my girlfriend? it would close spreadsheets, emacs, un-mount journals and personal drives. PAM's used to reauth from the screen-saver, right?
Some partners expect to share passwords as a trust thing, but my work does not allow it (and most personal devices have access to work stuff).
if passwords also covered account scopes -- which is what this tool enables one to monkey-patch into the OS, i could give you my password so you could gorge on my code without me having to worry about you reading my journals or abusing ~/.ssh
other than that, i second your notion.
I'm thrilled by the idea of using passwords to switch between the sorts of things i do without having to log-out.