Interesting Thomas,
One would think that if it works for Poser, a similar way could be found for sketchup.
But what about Vista (and its 64 bit versions)?.
Vista has the 3B switch 'on' by default, but in a global way, not per application...
I am not having the impression that SU is large adress aware in Vista neither (=I experience the same crashes as I used to have using XP 32 bit when exporting large SU files to a render engine).