We don't have much of expertise in this area yet, so if you know some tricks with the shaders, feel free to experiment and provide the results, of course as you have already done. We decided to use the old tmines in 0.3.1 because the new ones are still not perfect. But tmines in 0.3.1 are now shader based, so you can continue your experiments on 0.3.1 without need to change the binaries to specially prepared for this purpose.