MPFB2 includes a T-pose, but it is T-pose with limp palms and fingers. I believe that MPFB2 should include a T-pose with arms, palms, and fingers parallel with the x-axis and thumbs that are parallel with the x-axis and 45 degrees away from the fingers.
At the moment, I have to go through the tedious process of connecting all the bones, enabling "Auto IK" and "X-Axis Mirror", straightening the fingers with "Move", and attempting to straighten the thumbs without them looking too deformed.
Also, since "Apply as rest pose" / "Apply Armature" destroys the shape-keys, it would be nice if we were given the option of starting off with a straight T-pose model.