Membership - Ability to track who used what coupon code?

Is there a way I can track what members signed up using what code?

Also...

Is there a way to see how many coupon codes were used in a given timeframe...say I want to know how many times a coupon code was used in March?

If there's no way to do this now, how can I request this as a feature in the future. Should be helpful to others as well.