That's "simply" not simple... (it is very early here... ;-) ).
Barnabus, I am indeed curious if it would work for you. I just reread the passage, and realized that perhaps the OSD WILL output from BOTH the s-video AND the composite outputs (and the component output as well) IF the video signal coming INTO the 990 is EITHER s-video or composite, but not both.
Thus, the question becomes:
Can you input COMPONENT video AND S-Video to the 990, and have the OSD and Video signals output from the S-Video and the component video at the same time (as long as there is no composite input to the 990 happening)?? If this is possible, than one could use a local monitor at the 990 for the video and OSD, at the same time as the 990 is outputting both s-video and component video to the projector and tv.
Does this seem correct???