When I had a wireless mouse plugged into the serial port, the installer would segfault (signal 11) right after it printed something about detecting the mouse on the screen. The system would then shut down, and I would be unable to install RH 6.1. I solved this problem by plugging a Logitech mouse into the serial port. I'm sorry I can't provide more details, but this is happening during the installation process. If you point me to a stand-alone version of the mouse detection program, I can let you know exactly where it fails (and probably why).
I believe this is the Logitech Cordless Wheel Mouse or the Cordless Desktop (the mice for these are interchangeable).
Not able to replicate in test lab. Try the latest cut of the installer and see if you are still having problems. Please reopen bug if you are still experiencing problems.