Not that i have any experience with this, but since motion usually involves an accumulation buffer:
Would it be possible to:
- disable v-sync and render more frames than the monitor will display
- blank this buffer when a frame has been displayed
You can't see more than your monitor can render as you look at your monitor to see the game. The monitor just works on like 125Hz. It will look like you render a lot more frames when the framerate is 125+, but that is actually just the framerate drops which being whiped out (a bit).
Asuming, 120 frames on a 60Hz screen:
Your monitor can display a picture which is composed of 1 one frame that is between 0 and 8.3ms old superimposed over a frame that is between 8.3 and 16.6ms old.
So in case of a rocket, you will see 2 rockets, the top one beeing a slightly more current version.
Having extra rockets in your display will (i think, and this is pure speculation) help your brain interpolate the motion of the rocket.
Edit: so the gap (visual difference) between frames is smaller than normal
I know there exists 120Hz screens (still missing 30Hz IMO) but you could easily run openarena at 500 - 800 fps. (which would probably be awesome)