Can you allow the backer to choose the number of months they will donate for?

I love the Fundraising app and now have it installed. But I badly need the functionality where the the backer who wants to contribute monthly (or weekly) can choose the number of months they want to give for (i.e. Give $20 per month for 12 months). Is there any way this feature can be added on?

Alternatively, is there any way to set up a default where all recurring donations are set for a year and I could just inform them of that?