Yeah, that's what I would have thought, since the scrubber itself is really just a preview scrub.  Gotta turn that info into something that churns out frames.  As long as I can see it happen in preview, know what I mean? It's just a real-time "looper", where you can go back and forth as much as you want, in any speeds or increments you want.  Like, lets say you are animating a waterbuffalo humping another water buffalo.   You could animate a single, full range of motion thrust, complete with flexing taut muscles and curling "toes?"...heh heh. Then, with the  scrubber capture I would love to pay for, it would be easy to create a sequence where the humping goes through all kinds of natural humping actions (changing thrust durations and frequencies and range of motion...all by dj -ing the scrubber).

Oh, and BTW, this is just an example, and I am NOT going to use this to animate humping...not that there's anything inherently wrong with that...