Recently failing with this because the rollers were too steep and abrupt, not flowy, the next logical limit is to consider pedal strikes as an option for roller peaks.
There are more than a few ways to do this. Parabolas and circles came to mind. I think I like the circle or chord/segment method better.
Beyond this^ of course is the easy way: build a roller, get a bike, and roll it with a crank/pedal down. Of course most of the time pedals are not down when pumping over rollers.