Include a sessions folder?

If its not optimal to include a folder, then sessions should just be turned off by default. And add a couple of lines to the config with example paths for a session files folder. Even in the manual on the session library page there are no examples of how to do this.

The huge problem is that sessions working half way without explicit configuration is much worse then not working at all. Because it 'works' it would be very easy for it not to be caught during development - and then have the issue arise after a site or app goes live.