The program in the marketo library has pre-made campaigns and uses tokens to define the scores. This is pretty maintainable as you can easily adjust all your scores from one place. You would need to add new campaigns if you want to start scoring a new behaviour or attribute though.
What type of tuning do you have in mind?
If you are thinking of literally uploading your own smart campaigns fully formed from a CSV or something like that, I have never heard of that type of functionality.