Is it possible to set a custom schedule to run only on weekdays?

Is it possible to set a custom schedule to run only on weekdays?

I have a daily custom schedule that reminds users to return items they have borrowed. Currently, if a user has an item due on Friday, and they don't return it, they get reminders on both Saturday and Sunday. I would like to skip the weekends, so they only start on Monday. This would be a great option to have in the Frequency GUI drop-down menu...