Job-Execution in future

I know this can all be handled with rules or some other combinations, but this seems so straightforward for this module that I like to ask for this feature here:

Sometimes I have one-time jobs that I want to be execute in the future. E.g. when a customers has ordered an item, I'd like to send a mail in 3 days asking for feedback.
In this case I would simply call, e.g.

job_queue_add('drupal_mail', 'Description of the email process', array('some-email-id', $to, $subject, $body, $from, $headers), '', TRUE, "2010-05-25 10:00:00");

This job would not be executed until the given date.

What do you think?