Set rolling sample sizes for Engagements (ie. 5% per week)

Background: We’d like to launch a survey that engages a consistent sample size of users over time (ie. 5% of active users each week). This would give us a better understanding of overall user sentiment than a one-time spike of most users receiving the survey when it’s published, followed by a slower trickle of those who were missed in that initial spike. 

Problem: PX’s Engagement sampling feature allows us to set a 5% cap on users who can qualify for an Engagement, but it’s a static 5%. If all 5% of users who qualify for the survey see it in the first week, that’s it - nobody else is targeted for that survey. If I wanted to target 5% of users with one survey every week, I’d need to launch the Engagement with a 5% sample size, then increase it to 10% the next week, 15% the next week, and so on. That’s a lot of manual effort required to get a consistent flow of responses. 

Request: Allow us to set rolling sample sizes for Engagements (ie. 5% of active users each day, or 15% of users each month) in order to maintain consistent sample sizes.

Note: Appcues has an NPS Targeting feature that allows you to survey consistent percentages of users each day. This is the behavior we’d like to see in PX.