I would love to see a built in automated calibration routine. What I mean by this is you would click the tools menu and be brought to a calibration screen. That calibration screen would put some models with known dimensions and other stress tests right on the build plate. You would then print that model and after the model is printed it would ask for dimensions and other various print characteristics such as surface finish, blobbing and stringing. Once you have entered in the values it would then reprint to confirm and you could keep doing this until you were completely dialed in for dimensionally accurate fitted pieces...
It could be combined with build-in help. Models, routines, explanations, pictures, movies and tetris - all in one place. It will realize world's idea to make one big red button labeled "Make it done best".