Let's think of Torque Engine as a kind of hypothetical see-saw (teeter-totter). Shaders went up and were introduced. Terrains went down and were removed. Now lets says the maps got re-implemented, or they went up. This would mean that the shaders would have to go down therefore they would be removed. If we wanted them to run together then we would have to make a new engine (see-saw) that can equally balance maps and shadows out.