Most of the area does indeed look residential to me, but my understanding is that landuse=residential isn't supposed to cross streets, usually stopping before sidewalks. I've been going around replacing larger residential areas with multipolygons more closely matching the actual residential areas (for example, this relation/9788784). I probably should have waited until I had time to map the multipolyogn in the same changeset though, sorry...

Username checks out.

The only way I know to add a line to a multipolygon is through its Relations section, and to see that section I need to choose an option for the line. I've been using the generic Area option so far, should I go back and delete the area=yes tag after adding a line to a multipolygon? Should I use actual lines instead of areas? Or am I missing a much better way to do it? Fairly new to OSM still.