My spider senses told me that peds have to cross with the light. I'm glad to see the code affirms that.

The same tingling is telling me that, if the area allows you to bike on the sidewalk and you are so doing, then you are a pedestrian whether you are on the bike or walking it, i.e. the whole mounted / dismounted thing is a red herring. I vaguely recall some legalese that, depending on your conduct but not on whether your feet are on the pedals or the ground, you may be in either vehicle mode or pedestrian mode. Does anyone have and care to share the ground truth on that?

It does strike me that it seems most important to know the law so that we understand the risk profile and defensibility of the things we are doing wrong rather than how to do more things right. +1 for the common sense and judgement scheme, though that too can be elusive.