If I did this right, I've extended the time you can park it on one page (composing a long post?) to 2 hours before getting automatically logged out.  Most modern browsers are pretty good to recapture all of your hard work with the back button should you submit a post only to find you've been logged out...but I know this doesn't always work and it's frustrating.

While working from any open access computer, however, it also means someone would have a 2-hour window to initiate "having some fun" on your account and at your expense should you forget to log out on your own.

If you ever get an "unable to confirm security token" message, usually upon submission of a post after a lengthy time composing it, just click to submit it again (ignoring the warning) and all should be good.