This is the updated version of my First Script which u can use to change Render Engines. Am planning to add more render engines if i get their RenderClass.names. I would like to add other renderers too but i need their rendererclass names. You can see how to get that at the end of the video. Hope you enjoy this simple script.
UPDATE:
Version 4 Available HERE
OLD VERSIONS:
v3.00b screenshot: