Yes, it looks like Apple has refused user support for the script :-( The only thing you can do is (from the Apple Developer Forum):
Your only option is to drop it into ~ / Library / Scripts, and then go to File> Services> Service Settings ... and set the key combination.
This works, but it is only an incomplete replacement, as you will not have all the features that you used for custom Xcode scripts in Xcode 3 :-(
Here is a message showing you how to create an Automator action that you can use as a service in Xcode (through the service menu and assign a shortcut as above). I also did this (modifying one of my scripts to read input from stdin and write the output to stdout) and it works ... as I said above, it is quite limited and it is ten times slower than before, but better than nothing.
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