Set Dolby Digital for optical only, not HDMI?

Just wondering if there's a way to set the ATV2 to output Dolby Digital only over optical but not over HDMI? My TV doesn't support DD but (obviously) my 5.1 receiver does. If I leave the setting on "Auto" it just sends a stereo signal to both HDMI and optical, but if I turn it on to "On" then it works via optical but not over HDMI since the TV can't understand it.

I set up my TV as a monitor only and route all sound directly via optical to my receiver. I then muted my TV, and control sound via the receiver.

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    ToshibaDolby.zip ‏1310 KB

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