I just talked to Escort's Customer Support regarding locking out multiple signals. She told me that when you use the Lock Out feature you are locking out all signals you are picking up at that time. There is no way to cycle thru multiple signals to decide which to block and which to leave unblocked.
She also said that since the 9500i is new that the support and sales staff have frequent meetings to discuss customer questions and she would add mine to the list for next time. Maybe a software upgrade could solve this???
So all I can say is that if a location is giving you multiple signals be sure they are all false before locking out.