Great question! I'd be interested on it the answers as well. I personally don't.
However, I do have a couple of comments about "hot spots" on streamers.
When discussing "hot spots", I think we need to be more specific about the function of a "hot spot".
To my understanding a "hot spot" on a scud or Czech nymph pattern can imitate internal organs or an egg sac, so it is functional and imitative. Similarly, the "hot spot egg" on an egg sucking leech pattern is functional - it actually imitates something in nature.
On the other hand, the red floss on the body of a Royal Wulff is a "hot spot" although that terminology was not in use at the time the fly was developed. But it is not imitative, it is attractive. I believe a hot spot on a streamer would fit into this category, just like a the red floss on a Royal Coachman Streamer is an attractor.
So a "hot spot" on an imitative streamer pattern would be a hybrid pattern of imitator and attractor. It is a good concept and I look forward to hearing from those of you that have such patterns and feel the "hot spot' increases effectiveness.