Good idea - it would slow it down a bit, but I'm pretty sure it would be useful. The subway commute-time filter is a bit limited in its use, but you can use it

Good idea - it would slow it down a bit, but I'm pretty sure it would be useful. The subway commute-time filter is a bit limited in its use, but you can use it to try areas for their commute time to other areas. Also, it's not as useful, but if you zoom in on the metro stations on any google map, it'll tell you what lines stop there.