Stripe Subscription update

Stripe subscriptions needs more options. I need to be able to set an initial number of subscriptions or increment the number of subscriptions the customer has. I also want to designate what payment method to use for the subscription billing. For example. when a customer signs up, and they buy 5 widgets that all require a monthly subscription, I want to bill them monthly for the 5 widgets. Lastly, I want to be able to bill their bank and not a credit card as ACH processing fees are much less than credit card.