I have to disagree on this. On the MUPs I am used to using, if you are walking/running in the same lane and direction that I am riding I can slow down and wait for an opening to pass you. If, however, you are coming towards me in my lane I will have to come to a complete stop and put a foot down or we'll run into each other head on if I don't have room to pass you.

Also, if we are going in the same direction in opposite lanes (me on the right, you on the left), and I am trying to pass someone going in the same direction in front of me, you are now blocking my ability to safely pass. This puts three people in danger of getting hit: you, me, and the other person in front of me.