Pitchwife: can anyone suggest a way to slow down the look-around function?
GageBlackwood: Did you try checking the caps lock key? When it's down, it disables the processor limiter (aka. "turbo" mode), so walk movies and graphics play back faster.
There isn't a mouse sensitivity option in the game unfortunately - have you tried opening the Mouse settings in the Control Panel and turning down the acceleration and sensitivity as far as they can go?
Btw the Caps Lock function only speeds up Navigation videos, nothing else. It hasn't got anything to do with processor limiters, it just plays the videos twice as fast. Which is nice as it makes backtracking a little less tedious. Although there is a glitch in El Dorado where if you travel on one of the gondolas for a third time, Arthur is supposed to comment on it, but his voice gets sped up as well, which is rather odd. AFAIK it's the only time where that happens...