I just read your comment on how stretching should count for something in the Fitness Tracker. I agree! I finally just made up my own "Stretch Package" of exercises and assigned an appropriate calorie count to it based on how many minutes I stretch, figuring 10 calories for every 5 minutes (since SP assigns 14 calories/5 minutes of strength training). I've no way of knowing how accurate that is, but at least it gives me a feeling of accomplishment, tracking my stretching time!
PLEASE let me know if you get any useful responses or find out any guidelines on this!