[jpkw]

Not sure how you'd execute this, but I think a great method of control for rhythm would be like a karaoke bouncing ball that you control with a keystroke. eg:

  -I write out my lyrics
  -you break my lyrics down to [x] syllables
  -I choose this rhythm control option
  -I hit the spacebar [x] times, in my desired rhythm based on those syllables (maybe a karaoke style visual to guide this), & you calculate timings between each keystroke and then attempt to create rhythm based on that