There's a hack/mod for the various Goteck/Flashfloppy controllers that do this. A little piezo speaker you can attach that buzzes when there's read/write activity to simulate the clunk-and-grind of ye olde floppies. I'm sure such a thing could be added to RaSCSI/BlueSCSI.  A quick Google shows plenty of folks asking for this in both projects. I reckon it'll happen at some point.