There is a bug with recurring schedules in the current release which will be fixed in the upcoming one, however yes, it is possible to do this.
- Create a new on-call assignment for user 1
- select all day
- set the starting date to be a monday
- set the ending date to be something like a year or more from now
- select recur
- select weekly for the recurrence pattern
- Recur every 3 weeks
- select all days of the week
Repeat this for user 2, except have it start the following Monday.
Repeat for user 3, starting the following monday after user 2 start.
It doesn't appear there is a way for me to show who's first, second or third on call though - is that right?
The order is defined in the escalation steps of the group. You choose the first calendar for the first step, second calendar for the second step, etc.
Is there a way to set this up when the on call rotations start on the 1st or the 15th of the month and not a specific day of the week?
No, call rotations will start at the specified start date, and rotate relative to that. We do not currently support repeating relative to a specific day of each month.
We're getting ready to do some "show me how you use it" sessions with existing AC users to learn how to make the on call calendar better. We'd sure love your participation! All this is is a 1 hour GoToMeeting where you talk us through how you're using the on call calendar, tell us what you like about it, what you don;t like about it, and any ideas for improving it. People who participate in these "show us" sessions next week will get 2,000 thwack points; plus, there is a likelihood that your feedback will directly improve the ease of use and usefulness of on call calendars down the road. You can email me privately at firstname.lastname@example.org to set up a time or learn more.