Anyway, as for close-passing walkers, it's reasonably simple: Try to get their attention and let them get all the OMG! A bike! leaping out of their system before you get close enough to be a hazard. Given the distance that polite noises carry, this usually involves riding relatively slowly.
If you can't give them the width, children and other animals[1] should be passed dead slow, as they'll probably dive for your wheel at the last second.
That leaves you with the hearing-impaired and [ear]phone zombies. They're probably going to flinch when they see you, so aim for as big a gap as possible (waiting as necessary to avoid additional hazards like chutney and mooring bollards), and pass at a speed that means it won't hurt too much if it all goes wrong.
Accept that as the out-group member and operator of the more hazardous vehicle, it's all your fault.
And if you can't do that, don't cycle on shared-use paths.
[1] With the exception of the Aston ASBO Geese, for whom ramming speed is entirely appropriate.