Yes, I'm running my OS from an SATA drive, but I've also got two IDE drives for storage (where my games, music and films are). It's already set to IDE in the BIOS, so I'll remove the configure-jigger.
Apparently JMicron has a problem with being able to use DMA properly, which is why it switches over to PIO. Right now both of the drives are set auto to DMA.