Found this post too which states that the bearings are 6mm wide in the BBs for the carbon cranks to allow room for the wavy washer as opposed to 7mm in Shimano BBs.
http://www.bikeforums.net/showthread...=1#post8412886
Seems then that a Shimano BB would possibly be OK without the wavy washer, but the bearing load is going to be hit or miss.