Not wanting an argument at all Shoebox, it's just the voice of experience on my part so I am sorry if I came off as combative. (hangs head) I typed in the tone of voice I would have growled at one of my trainees during my FTO days. All I'm saying is rules are fine tempered with plain old common sense.
Back to the main topic, I have seen flashing strobe lights that riders can hang on stirrups or hung on a breast collar. I always thought they were a good idea unless you were riding with another horse that wasn't used to the sight-perhaps those strobes could be used not only for safety but as a tool for desensitizing?
We grow too soon old, and too late smart.