Of course i did not think I had to explain in detail but thanks for doing so, The REASON I have Priority turned off in my scanners is because of the constant interruption to 'check the channel' since with only one receiver that is the way the scanner determines if there is a Priority transmission.
There are any number of threads on the forums on rr.com asking "what is wrong with my scanner?" something keeps interupting stuff I am listening to? The answer almost always is "you have priority turned on" since your scanner only has a single channel it can receive at one time that is how it works.
For myself, don't need or want that and so the lack of that "feature" in the HP-1 is not a problem to me at all.