Membership 2 Pro: Pro rating cancellation?

We enabled the pro-rating add on but it only works for upgrading or downgrading. Is there a way to pro-rate payment when a user cancels mid month. We are using Stripe, which allows pro-rated payment but could Membership 2 Pro allow returning pro-rated amount in case user cancels before end of month?

Also, when downgrading (from a paid to free) membership the original (paid) membership is not automatically cancelled. How can we change this setting?

thank you!