Thanks for the reminder that I can do the trimming in Quicktime Player. I hadn't thought of that.
I bought a Quicktime Pro license in 2002, back when I was still using OS9. It doesn't look like I ever upgraded Quicktime 7 to Pro. Apple still sells QT 7 Pro, but adding chapters in it seems terribly convoluted. Looking at the user guide, you have to startby making a text file with the names of the chapters, and then go through 20 steps, including adding the timecode for each chapter manually in the text file. For this, I get to pay $30 to go back to the previous version of Quicktime? QTMarker ($24) looks straightforward and simple, but I might first try Metadata Hootenanny (free) and make sure that the chapters show up properly in iDVD.
Premiere Elements is still tempting, to edit more that just heads and tails, as well as adding dissolves, soundtracks, slideshows, etc.