Add more yearly goals
The following would be super-easy to implement and will make a lot of people happy: extend the list of types for yearly goals.
Right now we have distance and time. Because I live in an area with a lot of hills, usually "meters climbed" is my prime metric and I would like to climb more this year, than I did last.
Same could be valid for all other types (like time in a certain power-heart rate zone, calorie output etc).