Already done them...

For Watch OTA HDTV

Start a new avtivity , select watch TV and select simple television activity. Select your compnients as necessary and then rename the activity. You may need to edit the activity to fudge the channels as I did.

For Listen to DMX I started with anoth simple watch tv activity and then editied the XML to remove the television from the list of devices activated. The nice thing is that I get a list of channels on the LCD that have the DMX channel names and it's real easy to switch between them.

Hope that helps. If you need help with the XML edit's ( it's fairly easy if you just follow what everything looks like ).