just a suggestion.
routing as normal, i.e from X to Y.
once it has routed, having the ability to 'extend' the route.
i.e If Bikehub app routes from X to Y and it comes out at , lets say 10miles, it would be cool if I could say to it ' extend this to 15 miles'
I am thinking it would be a good feature for training / cycle to work etc when you want to start adding a few miles.