I think here on AT they just started up a game and tried to so the exact same movements each and every time (manual control).
If you had to be exact, you would need a lot more than just a save game, you would need a script that executed movements for the player.
I would suggest you use the contruction set and make your own. I dont know of any other way.
EDIT:
As far as stress testing goes, do like AT did and walk around an Oblivion Gate with a bunch of different monsters running around it.
Actually, towards the end of the game is a scene just like that. You have to take a variety of soldiers and defend a town against an influx of monsters. That really killed my system, even when I took the details down.