Another #UrbanPlanning algorithm I plan to pick back up is like "Percent High Comfort BikeShed" (or WalkShed).
The idea is compute the area from a given a location that you bike to within 15 minutes and then the area that bike to *with high comfort*, like protected bike lanes and so forth. Divide them to get the "Percent High Comfort Bikeshed" for that location.
"Percent High Comfort Bikeshed" may be harder to package for #QGIS because it involves running a custom #valhalla server currently-- building a graph to generate the bike isochrones (travel-time area) using only the high-comfort facilities.
If there's a way to query Valhalla such that only a subset of the network is considered for routing, then I could run it against public servers.