But my search was not entirely useless though. In fact, It was more exciting than just getting a shell on the camera. I stumbled upon a Free and Open Source firmware add-on for several Canon A750. The project is called CHDK (http://chdk.wikia.com). It gives amazing number of possibilites including some standard features like raw CCD dumps and video compression unfortunately not provided by Canon.
As a precaution, I suggest you wear a seatbelt and have a glass of water/ friend ready before you read the entire feature list.