Thank you for writing.
The definition of range is that it has a start and it has an end. By disabling the weekends you limit the range to 5 days. You cannot have a range if there is a gap of two days. It is no longer a range, but rather becomes a collection of ranges.
The calendar currently doesn't support such behavior. You can still select more than one week worth of cells if you use the Multiple selection mode.
I hope this suits your needs. Implementing a collection of selection ranges would be a task exceeding the context of this ticket and if needed I must log it as a feature request for one of the upcoming releases.
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