After I place my clip on the timeline from the trimmer as "Video only", how do I go back at some point and decide that I really do what the "Audio" as well.
1) double click on the video event,
2) right-click on it and choose 'open in trimmer'
3) right click'n'drag the audio from the trimmer to the timeline and make sure it snaps to the region highlighted around the video event you double-clicked in step one.
I'm sure there is a 'Orphan Wizard' that does this in 'Excalibur' - wait for a bit and someone will probably post and confirm this. It automates this process if you have lots of clips to add the audio back to (I think - I don't own it).