Never mind. Someone helped me with it:
Basically apply this multiplication expression to the postion of the camera and all lights (from mylenium:
[position[0]*100,position[1]*100,position[2]*100]
Then apply this expression to the Point Of Interest of the camera (from ats):
[pointOfInterest[0]*100,pointOfInterest[1]*100,pointOfInterest[2]*100]
works like a charm.
This translates feet world units in XSI to pixels in after effects. Meters the factor would be 1000.
-b