I would love dovetail to add some GWR steam locomotives such as a 57XX Pannier, small/large Prairie or even a Manor. These would ideally be suited for the WSR route.
No more steam unless a 3rd party pick it up. Then it's a matter of whether or not DTG fix the physics.
Already told the OP in his Tornado thread the situation regarding TSW and steam traction. There's not much point in posting requests until they decide (or even if) they decide to overturn that stance.