Add a rotation functionnality

Hi, first of all great job, this module is really good.
I just wanted to expose one use case I'm aware of in which it isn't flexible enough to be called perfect.
I'm working on a website with over 500,000 pagePaths saved in Gooogle Analytics, many of them not beeing node paths. Knowing that the G.A API allows only 10,000 pagePaths per metric in a call, there is a lot of pageviews that can't be fetched using this module. (A classic call get's me back some 5000 paths).
So my first idea was leveraging the startIndex parameter in order to run through the entire set of pagePaths in multiple calls.
I would like to have your impressions on this matter, and I would gladly work on the patch if it sounds like a thing you would like to integrate in your module.