Hello! I’ve been mapping this area that follows a superblocks type of urbanism. The wider district is divided into superblocks, and these superblocks have no through traffic, the only way to access dwellings inside of them is by either walking or through small streets that all end in dead-ends with parking.
How should I tag these dead-ends? Should I treat them as parking lots or as regular highway=residential?
residential or living-street, whatever the area signing is when entering.
(See a few+ of unconnected way stubs… connect with highway=footway + footway=link e.g. to make it all routable.
Do you mean the ones on the upper-right corner of the second picture? I was gonna get to those soon, as I’m working superblock by superblock 
Or perhaps you meant the residential street dead-ends? In that case I don’t understand why they should be connected, why would I want any router routing pedestrians through the street, or vehicles through the sidewalk? Unless it was meant for emergency vehicles
Of course you need to ascertain if any of those dead-ends are crossable to the nearby walkways. If there’s fencing then put a noexit=yes on the dead ends (if nearer than 15 meters from any other way.
1st picture, right hand a footway folding around a parking and a (service?) way end. Prime candidate for such a link way, and else QA’s like OSMI and Osmose will flag those ‘near’ ends for a revisit.
Of course if a way is footway routers no to not go in if your target is behind the block.
