Extending ci_sessions table

[eluser]thomasR[/eluser]

Note: Session cookies are only updated every five minutes by default to reduce processor load. If you repeatedly reload a page you'll notice that the "last activity" time only updates if five minutes or more has passed since the last time the cookie was written. This time is configurable by changing the $config['time_to_update'] line in your system/config/config.php file.

This is from the manual.

I'm sure someone must have done this before. How is it done in this forum? Is there a free library?