Preferences is bound to command+, by default. Suppose I want to add an additional key binding so that F2 (for example) also binds to Preferences? It must be possible because a few of the standard commands have alternate keystrokes.
According to the docs this is possible, but only with text commands.
"To add a sequence to an existing one, click the Add (+) button and type the new sequence. This only works for text commands; you cannot assign more than one sequence to a menu command."
You can find that in "Xcode 4.2 Developer Lbrary / Tools & Languages / IDEs / Key Bindings Preferences Help / Customizing Keyboard Shortcuts"