If someone has bothered to install add-ons, he probably knows about red roads. But no problem, just make the feature r3 and up.
As for what the default city is, it would be nice to have it set to the city of its attachment point(s) rather than None. If the cities are different or incomplete, then the City field cannot be automatically completed.
I've net seen an explanation for why political boundaries aren't stored in a single database somewhere.
We really shouldn't have to set the city name at all. There would be no smudges. It truly would save a lot of work.