Probably should have bothered to check to see if a thread like this existed but to get around the lack of the TrainerRoad API I wrote a couple of dozen lines of python to pull my weight from the Fitbit API and uses selenium (via headless Firefox) to update my weight in TrainerRoad
As I weigh myself first thing every morning the program runs silently when I first turn on my computer each morning
Happy to make the code available to anyone who wants it