Let users chose the subscription period (with discounts for longer period)

suggestion:
It would be nice to have the following feature added to the RSmembership (nice to have):

I do offer memberships based on a montly fee. If a user signs up it would be nice if he could have the choice of the period of the membership for which he signs up
(based on settings in the frontend).

The user can chose to sign up for 3 month, 6 month or 12 month and gets a discount of
a certain percentage. Lets say he signs up for 3 month (the fee would be 3 times the monthly fee minus a discount of 5% (per backend setting), if he signs up for
6 month he gets a discount of 10% etc.).

The multiplier-periods and the discounts should be configurable via backend. So the user gets a higher bonus if he decided to chose the longer period.