I've had fun doing this as well, usually with levers that open doors. The only place I actually remember carrying this out is in Magog Motors, having Munch pull the lever that opens the corridor to the edit, then quickly switching to Abe. I think the camera goes through walls sometimes when doing this. I haven't tried it in any Sloghut, but I'll keep it in mind next time I start the game up.
Lulu Fund: Simply locate a lever that moves the camera, such as the many levers at the end of Sloghut 1027, then use the black button to switch over to the other character when they're at the other end of the level. What you get is a zoom through the level, something like the first fly-over of the SpooceShrub Forest level, but many times faster.