It wasn't that post by them. I'll look for it. It's the same post that mentioned adding speed limits. And yes, I know it's not in beta and will likely be a long way down the road. Just saying that they said it was at least planned at some point.
Ok, it took a little work, but I found it. Here
is the post from shirlig that comments on adding walking and biking to Waze. See list item #3. Now, this is obviously just a goal and may or may not ever be fully added. It's too soon to know, but it is at least on the table. As far as making it less work to add all of the walking and biking areas, I think Waze should consider adding checkboxes to street segments allowing you to mark a check if a sidewalk is present as well as mark a check if bicycles are allowed. That would save having to add a ton of sidewalks and bike lanes to the map that follow the roads. In short, it would save a LOT of work. Then, all that is left is adding paths that do not follow roads. Just a thought. And I think we'll find that there are a lot of walking and biking enthusiasts who would put in the time to get their trails mapped in Waze even if they have no interest in mapping roads. And in some countries or some areas of countries, you may even find more editors for biking/walking than for driving. And though it's a long way down the road, I'd also suggest that Waze separate walking/biking trails from the road layer so that editors can hide roads and still see the trails or hide trails and still see the roads. It will make it far easier to edit without needing to see everything at once.