I used hand signals for many years, and when I took the m/c permit test in the early 70's, it was a mandatory component of the test(MA).
I wasn't concerned about riders using turn signals of any kind when I asked my initial question. I figure if you are going to ride for any length of time and stay in one piece, it makes sense to minimize other folks cutting you off or otherwise causing you harm, by signaling your intent before making a turn. We're a courteous lot by nature and necessity, right?! My question was is it too much to ask for other drivers, and especially LEOs to show us the same respect, if not concern for our safety, in return.