Do the opposite - if you can export to SVG, then things such as editing names is easy in an SVG editor and doesn't have to be in this one.
On the other hand, I'd wish for more control over size than just "small, medium, large" buttons. I have size data for my towns and would want a slider for population size or building number.
For finer control over city size you can try non-itch version of the generator like this:
http://fantasycities.watabou.ru/?size=25
This will generate a city consisting of 25 wards. This "25" is not exactly population size, not building number, but it's a little more accurate than small/medium/large.