At BMST, I had thought that the use of a speed hump in all but partial streamlined was not allowed, but having re-read the rules about 3 times last night, I can find no mention of it. The only possible rule that may apply is as follows:
5. J. OPEN CLASS
Open class motorcycles do not permit streamlining. Streamlining is anything that has the perceptible purpose of directing or controlling the airflow around the motorcycle and/or rider, thus reducing drag.
So it may be a judgement call by an inspector, and a written request to the tech committee may be the only way to confirm that the speed hump may be used in other classes. I, too would like to know the answer so I don't end up with two sets of leathers to run open and PS classes.
Tom