I noticed that you can create/add a new type of tracking when you do an update, but there doesn't appear to be a way to edit it (e.g., to fix typos or to change from one type of tracking to a new one).
NOT a high priority, but it would be nice to be able to edit at least the labeling for the type of tracking; or to delete it (and it is probably fair that if you delete a unique way of tracking, then this will (with a warning) delete all of your updates in that type of tracking).