I want 2.07 to support custom GLSL shaders, even if experimental. For now it will be of limited use due to interaction shaders being locked to standard only (for reasons of compatibility with existing missions). One particular place where we could apply a custom shader could be the skybox. We have standard sky materials with multiple stages, that cause massive fillrate overdraw. If we could reduce those to a single material, the performance be could significantly improved. Another possible appli