I think you may have missed the point of what I was saying. Here's the page from the manual for your camera that covers it.
According to that:
-A large image is 4320x3240 pixels
-A widescreen image is 3744xx2140 pixels
Assuming you have enough space on your card and have software to crop the images there is no advantage in shooting a widescreen image. In fact according to that you get more
pixels on the width with a normal 4x3 image!
You don't get more space for shooting in widescreen. You are in fact just throwing away pixels from the top and bottom. Useful if you're running low on memory card space but otherwise there's no point.
The last sentence of my first post said it all really.
"There's no penalty for taking 4:3 pictures and then cropping them afterwards whereas there is a penalty for taking 16:9 and cropping to 4:3."