CTRL_Ghost is a custom shader by CTRL (have made many "hack" style MR shaders in the past.) The recently updated one for 3ds max 2011 works with Softimage and exposes the progressive rendering feature. You can download it from here and here.
The plugin also unlocks Image Based Lighting, Importions, FG Contrast, Irradiance Particles/Environment but most of this is unnecessary as the render manager exposes most of it. However, it may also expose
Also in the running (and currently nicer to use) is mrHiddenOptions - the thread and downloads are here.
Both can be installed