Is there a way to activate the RCA composite OUTPUT if using S-Video as INPUT - or does the selected input source simply "pass thru"? My Dish 322 receiver has both outputs active, and I need one more composite out.
It is not possible. If you feed the Slingbox with the S-Video input, you must send the signal out through the S-Video output and so with the other outputs / inputs. It is not possible to switch to a different output type.