Subscription Start date

Hi,
Thanks for writing such a great plugin. Our non profit would like to use it to let people make monthly payments for classes that we offer. Is there a way to set the start date of subscriptions? For instance our classes run from Sept – Dec, we would like people to be able to signup in July and August but have their credit cards to be charged on the 1st of each month for 4 months starting in September.

All our classes run on the same schedule if that makes a difference.

If your plugin is not capable do you know one that would be?
Thanks!
Tobias