The current max packet rate (6x) is way to choppy to make a decent movie out of a .mpr file. Additionally, every time there's a packet update, the car moves choppily to its updated location. I think we should increase the max packet rate to somehting higher (10x perhaps?), although this would be tough on servers and player connections alike; OR (this is a better idea), create some kind of packet smoothing feature so that the car doesn't look all jerky because of the lowish packet rate. This would improve possibilities for movie making and would just make the game look better.
In summary, for those who don't want to read the whole thing - Make a higher packet rate (perhaps 10x), or create a packet smoothing feature.