It would be nice to have a rule for drum rolls. Many vsts don't have built in roll articulations, but with modern instruments you can do it manually. I'd like a rule similar to the custom trill rule. Once triggered it would play the same note repeatedly for the duration of the note. The length of the repetitions should be user definable, it should have a velocity randomness parameter and a length randomness parameter. Using these 3 parameters it should be possible to make a realistic drum-roll/trem.