Jeremie, One other person wrote about the Sunnyvale app as well. I was not aware of it. I cannot add any more details to my proposal because I had to leave the workshop early and missed the discussions where the team agreed on this idea. I just was the "lucky" one who got tapped to input the idea. Since the workshop gave me no way to contact any of the other people on my team at the workshop (aside from my sister, who was at my table), I don't have any way to further develop this idea. Still, if something could work within the existing app, that would be great. I guess I should try out iGreenSunnyvale app. My husband tried it out, but he didn't find it so valuable to him - at least at that time.
I know the challenge has closed, so let me know if there is anything else. I will be away without electronic access from June 4 through June 10.