I would like to have an addon that tracks my movement.
Every x seconds or milliseconds it saves the my zone, the time, and my coordinates.
Then there should be offline software (or web page) where I can upload my movements and press "replay" to see how I move around in wow. Especially useful for raid analysis. All ppl of the raid upload their movement file, then the positions of everyone can be replayed.
Fraps can only show a single player and you cannot merge multiple fraps into a single raid movement file.
I think he wants to merge all movement coordinates into a single huge database where you can see that on firefighter (P2) at 5:00:03 20 ppl were standing in front of the boss and thus the raid did take a damage spike.
By raid tactics 10 people were not supposed to be there at all and can be 'flamed' for not knowing where the **** to be standing.
I did some tests for something like this a while ago. Don't need everyone in the raid to be running it, you can get coordinates of everyone in the raid and in the same zone. Lag of course introduces some inaccuracy but not more than you see in game.
I made an addon to track everyone in game and then a Java application to replay it all. The in-game addon kept track of everyone in the raid pushing new coordintes in a table whenever there was a sufficient change in their speed vector. So people standing still or running in a straight line wouldn't generate new coordinate updates but someone running in a circle would do it all the time. For long 25-man raids this'll take quite a bit memory of course. I just simply stuffed it all in big tables but if you packed it in strings or something you could probably do it much more efficiently.
In the end I got a very accurate replay of some boss fights I tried it on. Could clearly see people (well most of them anyway) running away from deadly stuff or whoever got chased by Anub kiting the spikes far away etc. Frame rate in game didn't really take any noticeable hit. The coordinate tables end up pretty big if you keep it running for hours. With two hours of 25-man coliseum raiding I ended up with a 10M savedvariables file. But like I said could surely do this much better.
I'd really like to see something like this combined with an offline/online log analyzer. I had some plans to start doing one myself but haven't found the time for it yet.