It used to work like that in a distant past but was discarded at some time because it did not work reliably and ate computingpower. I too think that extra nodes are a bad idea in general but a single wellplaced extra node that improves trafficdetection can be ok. I use an extra node about every 4km for highways in the country, 1-2km for high-congestion areas (like Kölner Ring). It is always a tradeoff - more nodes, better detection, too many nodes - bad routing. At any rate it is better then the 10 nodes/km from the basemap.
In general: we CAN anticipate bugs in Waze by adapting the map, but should do so ONLY when those bugs touch core-functionality (trafficdetection and routing are). The extra nodes can be removed very quick if it ever is needed.