If I'm planning on painting a body texture in Photoshop, which body OBJ should I use, the dev rig's or the production's (I actually forgot to put this one in the email, my bad)

The DEV CR2 and the full CR2 both point to the same obj. Just use the LaFemme1.OBJ file in the Geometries folder. If your painting program of choice does not support UDIM tiling, see this item in free stuff:

LaFemme NoUDIM UV's for UV Mapper

Going forward will there be an update that addresses the boniness of the fingers and the seeming total absence of tooth morphs?

The fingers are already addressed. If you inject La Femme's body morphs from the Pose library you will find a number of morphs that soften her hands, widen or lengthen the fingers, and increase the hand size. Changes beyond that may affect rigging.