Hate to be the one to (always) bring this up, but contrary to what force312 said above, warning riders to keep arms down, or printing warnings on tickets, or whatever else a park may do to keep its insurers happy, will do little to nothing to protect them in the event of a lawsuit. Had someone injured themselves on MF by touching that support AGAINST THE STATED RULES and then sued CP, the park would lose. Guaranteed. (Please note - I am not defending the new American pastime of frivilous lawsuits, merely recognizing reality. Having said that, in this instance, I do believe CP should be liable. Regardless of a ride spiel, CP knows very well many (most) riders will at some point raise their arms, and therefore has an obligation to design their rides taking that into consideration).
Thank you for your time.