Without prejudice to the powers of the judge-rapporteur pursuant to Rule 110.1, on a reasoned request by a party lodged before the date on which the judge-rapporteur intends to close the written procedure [Rule 35 (a)], the judge-rapporteur may allow the exchange of further written pleadings, within a period to be specified. Where the exchange of further written pleadings is allowed, the written procedure shall be deemed closed upon expiry of the specified period.