I've gotten SPB and TF3D to work by setting up the phone to start in TF3D, and configured a soft key to start SPB.
After a soft boot, the phone starts in TF3D. The first time I hit my SPB button, it loads the SPB (takes less then 10-15 sec, but just for this first time).
After that I just hit "Show Today" on SPB and TF3D comes up.
in TF3D, I hit my softkey, and brings back SPB.
Quick & dirty (and easy to do!)
