For what its worth, I just called the SWABIZ number and was told that the travel funds are restricted to the person that they were originally booked under, regardless of whether the ticket was booked under SWABIZ, or not.
Now, its completely possible that I got bad information--many times different reps tell you different things, but that is what I was told by this rep, FWIW.
If you are told differently, please get the name of the SWA rep that told you differently, so that I can reference them when I call back.
My company has about $250 of funds broken out under 21 different reservations that would be nice to combine, which is why I called when I saw your post.