In advanced booking can we get the tick box of Include weekends to work when it is under a 7 day booking.

Currently our site wants to allow a 2 day advance booking because when it is on 7 the users just book way in advanced and do not release the desks which effects us negativley.

But when we have it set to 2 days on thursday we are meant to be able to book the following monday but because of the weekend it doesn't go that far ahead. So on thursday we can't boopk anything later than saturday. Even though the include weekends tick box is not selected it still counts the weekend. I understand this is because it is less than 7 days and it that function works for 7+ days. Please Can this be ammended so when we do less than 7 days it does not count weekend unless it is specified to ?