I hope it works as well as it looks. 
It makes me want to code a plugin for conjobs. We can have the cronjob on a server, but it’s also possible to trigger a job from the site and the panel.
When adding, saving, deleting, renaming or updating a page, it could check the time when the last run was and if it was more than x minutes ago, run again.
It could do the same thing when a page loads for a user.
A textfile for each job could be used. Maybe it does not even need to read the file, it just need to look at the modified timestamp of the file and update it accordingly.