I'd like to use the LTP for situations like, for example, where I have someone someone speaking at a podium and I can clip the LTP in position, then shoot from the middle or back of the room with a longer lens. I'm trying to avoid the snooted straight-flash approach.
The softbox seems to have limited usefulness for moving around a room with it except for when I have someone else to hold it
Softbox III or LTP works well as long as you keep it within 2-3 feet of your subject. At events and parties I often hold the wireless flash with softbox up and to the side in my left hand and shoot the camera using my right hand. It's a photojournalistic technique that works great if you can get close to your subjects. As you indicate, you can alternatively clip an LTP in position near the subject, then move further away for the shots.
I just got back from the Flashbus tour event in Chicago, and both Hobby and McNally use Softbox III and LTP all the time, sometimes just a foot from the subject's face.
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