Basiscally that would be possible, but not with the current software release. Maybe we could add a 'record' button to the 'Where in the world is ...' section. Of course that would have much less data than are in the 'normal' uploads (no speed, no altitude, ... just the position). We'll think about it.
Currently live tracking appears as just a series of points updated according to the time interval set on your PDA. It would be better to show all the route. Is it possible to get the (Google map) to create a direct or follow-the-road route based upon these positions? Then, as long as you are not going too fast and hence travelling too far between points, this would enable the calculated route to be displayed using a greater transmission interval time.... and hence save $