Hello all I was thinking of buying a Screenplay 4805 but have hit the vertical offset problems that others on this site seem to have faced i.e. to get the screen at the viewing height I want and the size I want the projector has to be 85cm from the ceiling – which is just too much. Three sets of questions follow: 1. Why is it that it's not recommended to mount the projector closer to the ceiling and use the keystone function to correct? Does this damage the image quality or what? 2. If I need to now consider a proj with Lens Shift, which is the best for around the same money as the 4805? 3. Another idea I had was to mount the thing in/on a small table with castors and wheel it in and out of position when needed. Has anyone done this? How susceptible are projectors to damage if they get knocked while turned on? How much of a pain is this? What about all those trailing wires? All advice/comments greatly appreciated.