Hardware :: Apple Bluetooth Keyboard - Size And Key Mapping

I really need to free up one of the USB ports on my iMac, so was looking at the bluetooth keyboard. Now, I can probably get used to the lack of the number pad, but I'm more concerned about the lack of the delete key. Backspace is great, but I'm a full-time writer and sometimes the delete is a heck of a lot more useful. My local Apple store is a LONG way away, so I've got a couple of questions:

Is the keyboard itself the same size as the regular full wired keyboard? That is, are the keys the same size, spaced the same, etc (eg, the regular full keyboard with everything on the right-hand side chopped off)? Secondly, is it possible to map the delete key function onto another key that I don't use? Looking at a map of the bluetooth keyboard I'm not sure which key exactly I'd want to map it to as they've got rid of all the extras on the fullsize which I don't use.