Feature Requests: Improvement to Shoe Tracker

The shoe tracker feature is great, but it could be improved. When you log what shoes you wore on a given workout it shows you the total miles on those shoes. Unfortunately if you put another 100 miles on those shoes then go back to look at an old workout it shows the current total miles on that pair of shoes. How about keeping the miles logged on your shoes as a data element of the workout. That way we could go back and look for patterns. If you keep getting injured after 150 miles on a pair of shoes, you know that you are either harder on those shoes than most or the shoes are cheap. Either way, you can see that you need to replace them more often than the recommended 3-500 miles per pair.