Repeat event/task every "x" days
We have many options already, but none with a repeat every "x" number of days.
For example, my car payments come every 14 calendar days regardless of the day of the week..it's different days depending on the month. Also, I go running but take every 3rd day off with a rest day every third day.
Repeat event every "x" days would solve tasking/populating these scenarios.