Use both Delete and Backspace in Macbook Delete key in my MacBook Pro works as backspace in other Windows keyboards and
Fn + Delete works as 'delete forward' as an ordinary delete key in Windows keyboard.

How can I change the keyboard setting so that I can use both 'delete forward' and 'delete backward' using only one key-in?

For example, Eject CD key is rarely used, so I'd like to use this key as 'delete forward' key and Fn+Eject CD for ejecting  CD. Can I do something like this?
You can use KeyRemap4MacBook to remap the eject key to forward delete.

Partway down this List of Prepared Settings are details under "Change Eject Key."