I really like Locus and think it's better for every time I use it, I've start to use it as my primary tracker and misses some functions in the widget:
1: Start countdown, like the one avialable from the app itself, preferable 2 different countdown with possibiltity for two setable times, ie. one for start with picking out the bicycle from the garage, locking the door put on gloves etc. and one much shorter with just pick out the bicycle from the stand and sit up, or whatever different kind of starts.
2: Drop down menu with all tracking settings. I've just found this very usefull with a lot of different possibilitys, but it's not possible to choose from the widget and even not possible to see which one is active.