I don't think so either...I believe for the most part they adhere to the Senior Bowl rules. The press coverage I don't remember being a problem before, but perhaps it has been a rule for ages and I just can't remember.
People have to understand that the offense is at a terrible advantage against the defense in these types of games, and thus the rules. The offense has to learn entirely new schemes, calls, and modified signals in about 2-3 days. The defense does too, but it's a lot easier to say Sam or Will blitz than it is to adjust to blitz schemes with an unfamiliar OL partner next to you. QBs would get killed if everything was allowed.