A friend of mine was having problems getting Morrowind to run at all on Mac - after startup, his mouse would move towards the bottom of the screen "As if pulled by gravity", and he could only drag it up for short periods of time (when using Wine for Mac OS).
So, if you can explain to me how you get Morrowind in general running, I might be able to get him to install it again and see if we can work out a fix for the CS?