Paginator.requestPager: Option to set both howManyPer and Page number

[fizerkhan]

I tried to do set howManyPer using collection.howManyPer(50)
and then collection.goTo(5). These two calls performs the fetch operation separately.
I want to make it as a single fetch operation.

Is there any option to do it? Can i disable the fetch operation in howManyPer?
Moreover, howManyPer does not have success and failure options.