Our course Officer told us at the beginning that we were to be treated like everyone else on course with the exception that staff and students would use the proper salutations (ie: Sir/Ma'am, Mr/Ms). We were not to be saluted (otherwise we would have spent all day returning salutes).
BMQ is NOT a leadership course but --as can be expected -- we do frequently end up as the *unofficial* section seniors but I have no concerns about being accused of not demonstrating leadership because of the nature of the course. Nor do I think the staff necessarily have higher expectations of us. To be fair, of the 4 officers on my course, 3 of us are *more mature* and have families of our own and 2 have previous service experience so sometimes the leadership roles gravitate to us by dint of our advanced age (?!) or experience.
While I feel I have been given an opportunity that many officers don't have (ie. experiencing NCM training), I don't think it is necessarily the best system. That being said, it is only a BMQ. I would have greater reservations if I were missing out entirely on the leadership component (although I have concerns about whether BOTPII can file the gap left by doing a BMQ) or if the Privates were doing Soldier's Qualifications. I don't think there would be much room for an Officer to participate in SQ courses without detracting from the private's training.
Just my (limited in experience) .02.