A. It's pretty irresponsible for your neighbors to allow their FIV+ cat to go outdoors. Not only is he at higher risk for contacting diseases himself due to his weakened immune system, as you've already figured out he can pass it on to other cats as well.
There should be no risk of transmission to your cat from urine or feces. Transmission occurs typically through bite wounds, although cats have been infected in utero (clearly nothing for you to worry about). I sense this can be a difficult topic to broach with your neighbors but I would try, and then I would consider keeping my cat indoors if they won't. Good luck.
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