1. Use wav2lip. Hunt around the Ed Depot.
2. Waypoint speeds do not really refer to speed of the vehicle. Rather, they define how the group behaves. At full, for instance, the group leader will press on as fast as he can and not wait for his group if they fall behind. (I think)
If you want the wagon to move faster try giving it a slightly different route with less uphill. Moving waypoints slightly may help, but the bottom line is that loon armour drivers just like to go slowly for no reason that I can fathom.
Oh, and try to avoid topic titles like "two questions". Much better is something like "Lip synch and full speed".