items left in cart tiered email...

I'm glad to see that the email for open carts has been released. However, can we figure out a way to alter the time or duration of the emails that are sent? I believe clients will receive an email ever other day for 2 weeks, that is a lot of emails... can we shorten that? If not is there a way to have a tiered email notification? E.g. first email has message of you left something in your cart, next email has an incentive like 10% off code, etc...