Having said that, Route 66 have incorporated several features into the app that I've suggested to them, when sending customer feedback. Their customer service has been really good: on more than one occasion I've had their programmers get in touch and features added or bugs fixed very quickly (one one occasion they had a server-side fix for a traffic issue I spotted up and running within the day!). If it interests you, why not contact them and suggest it? I can certainly vouch for their customer services passing on suggestions to the developers.