Drive time enhancement

[dketza]

Ability to adjust the underlying speeds on the roadways via the GUI and eliminate having to modify the xml file and registry OR adjust the existing speeds in Guzzler that correspond to the urban roadways to bette reflect traffic volume and the resulting drive time polygons that are created in dense urban areas.

[Atabarezz]

That would enable us making our own open traffic data on top of open maps I believe...

[todd_henry]

Similar to this request, to select some road types to be avoided like toll roads or highways.