As an expert at making things MORE DIFFICULT than is necessary that's the type of thing we'd want to do. Ha. If you're doing it by location then 5 miles in New York is massive whereas 5 miles in somewhere may not be a big deal. The answer is to set defaults and leave it to the end users. I'm not sure what value you get by pre-setting for various locations when, like, has been said, you can use the mapping and sort by options. Nice idea.