I'm not a constitutional law scholar, but I don't think that the Right to Petition in the First Amendment is what allows civil suits. Civil suits is more from common law, as noted by the Seventh Amendment under the Right of Jury Trail.
But was the IUCRR a defendant in the Wayne's World suit? I was told that the NSS-CDS was the defendant because they managed access to that site. Going on that, how would have keeping the report secret have prevented the IUCRR from being involved in the case?
Walter had to give up several days of his life because he was called in to give depositions and testimony several times. Time is money.