Own points system according to importance of the task
I don't know about you, but some people (like me) tend to work on the easy things first. It would be motivating to have a separate points system where I can decide how much a task is worth in terms of importance. In that way I could assess my real progress, and tackle the hard tasks with more enthusiasm. I could also decide better on when to put the hard tasks in my schedule (in the morning, when I am rested), and when to leave room for the simpler ones (in the afternoon, when only 200 neurons seem active).