Except as otherwise provided in this subchapter, this subchapter does not repeal or modify any law of this Commonwealth:
(1) Authorizing the exercise of jurisdiction on any basis other than the bases specified in section 5322 (relating to bases of personal jurisdiction over persons outside this Commonwealth).
(2) Permitting a procedure for service or for obtaining testimony, documents, or other things for use in this Commonwealth or in a tribunal outside this Commonwealth other than the procedures prescribed in section 5323 (relating to service of process on persons outside this Commonwealth) through section 5326 (relating to assistance to tribunals and litigants outside this Commonwealth with respect to depositions).
(3) Authorizing the determination of foreign law or the proof of official records or any entry or lack of entry therein by any method other than the methods prescribed in section 5327 (relating to determination of foreign law) and section 5328 (relating to proof of official records).