The presiding officer must encourage all parties to agree that:

(1) For expert testimony, and all testimony based on economic or statistical data, all parties will submit written sworn statements in advance of the hearing by a date the presiding officer sets; and

(2) A party may object to the written statements on any grounds, except that the testimony is not presented orally; and

(3) A party may cross examine witnesses if the party makes a request sufficiently in advance of the hearing to allow the witness(es) to be present.