I don't think IDE/PATA drives support hot swap. Even if it is in a hot swap bay/enclosure you will need to shut down the system before yanking the drive.
I can deal with shutting the system down to swap HD's. I want to avoid having to crawl around on the floor, unplug and open the PC to switch HD's. So I guess my question should be, is there an internal bay with SATA hookup to the MB that is compatible with PATA/IDE HD's.