Hack X10 firecracker for robot use?

Has any body hacked the X10 firecracker for wireless remote robot use? This would be using the firecracker gizmo that attaches to the computer serial port to send bytes to the receiver, and modifying the receiver to output the received bytes to a controller or such. What has got my interest is that after many years, X10 is again making available the X10 firecracker just for the shipping cost ($5.90, link below). As a side question, what would be the best frequency to chose (USA) for tinkering with wireless data transmission? I'm looking at getting one of the inexpensive Liapac Tech transmitter/receiver setups to tinker with, and they offer 315, 418, and 433.92 mhz frequencies to chose from. Any particular frequency work better than others? Thanks for any info!