It would be nice if the mastery tracker would remember what you put in it so that you could track quests without losing everything in your mastery list.
It would also be very cool to have a separate page you could open for customizing the mastery tracker similar to craftworks, with a drop down menu to select items to track from a centralized location instead of going to item pages individually, and sets of items you could switch between, as well as a button to clear all currently tracked items.
