With respect to the chain trap in A11, the text and map suggests that the chains actually are a barrier to the PCs as they move around the room. I have gathered from the discussion here that this was not the intention. Given the case that these chains are not in the way of any movement, the statement on page 11 that "The chains laced throughout the room function as sensitive tripwires for the room's trap. Touching any of the chains or winches without first activating a hidden disarming mechanism etc."
implies that there is danger in moving about the room. However, this does not appear to be the case. I would suggest that this should have been made clearer in the box text for the room.
Without a hazard associated with movement through the room, this encounter becomes a simple perception check coupled with a disable device check repeated 8 times. This was hardly a challenge for the party that I ran tonight. Fourth and fifth level characters using spells and a magic item enhanced the point person who easily disabled each statue. This was the same result when I played this module (except that my not too bright bloodrager at level 3 was pretty useless since there was no fighting).