It appears that Apple did intentionally add a script to the Installer 
package which prevents the installation of Front Row on computers 
without a built-in IR receiver. It's not Remote Buddy's goal or 
feature to circumvent this.

You may find tutorials and patches for installing Front Row on the 
web, but I wouldn't use these. They are unsupported by both Apple and 
Remote Buddy, usually involve patching system files and are also 
legally questionable. If you have a Leopard capable system, the best 
and cleanest way to get Front Row installed on your computer is to buy 
and install Leopard. Leopard will install FR on all systems - 
regardless of whether they are equipped with an Apple IR Receiver.

Best regards, 
Felix Schwarz