No, I don't think I need the sync option since I always practice unmounting and then waiting for the prompt to come back (or the device to stop working, whichever is later) before I remove the device.
For fluppi, yes, it actually goes off when I removed the usb-ohci module
(after removing the usb-storage module, that is). I know it is safe to remove it, but it just feels a bit weird -- removing a powered-on device :P I know I always do that with my zip drive too, but with the disk ejected in that case.
But if I remove the usb-ohci module, then literally usb is not accessible. Is there any way to just switch the power off to just one usb device, then switching it on again after the device has been removed? (Like the Windows behaviour)