[support] Setting up cron job for user role updates

[Neil: esl-lounge.com]

Here is my wish: to run a cron job a few times a day to update all Authenticated Users to Full Members once they have posted five comments/forum posts.

My plan is to have all comments posted by Authenticated Users moderated but move users up to the Full Members role I will create to cut down on moderation work. How would I go about doing this? Is there any documentation on drupal.org about setting up cron jobs? There don't seem to be any modules to allow this. Userpoints exists but isn't free. A simple cron job seems to be the easiest solution all round. Has anyone else put something like this in place?

Neil
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