We also tested virtual CD, it seems worked fine. Below is udevadm monitor output: 

KERNEL[310.544164] unbind   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
KERNEL[310.544206] remove   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
KERNEL[310.544691] unbind   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
KERNEL[310.544737] remove   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
UDEV  [310.545677] unbind   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
UDEV  [310.546176] remove   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
UDEV  [310.547452] unbind   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
UDEV  [310.547917] remove   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
KERNEL[324.302442] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
KERNEL[324.303754] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
KERNEL[324.304074] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14 (scsi)
KERNEL[324.304193] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/scsi_host/host14 (scsi_host)
KERNEL[324.304238] bind     /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
KERNEL[324.304384] bind     /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
UDEV  [324.306827] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
UDEV  [324.308683] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
UDEV  [324.309922] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14 (scsi)
UDEV  [324.311232] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/scsi_host/host14 (scsi_host)
UDEV  [324.312534] bind     /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0 (usb)
UDEV  [324.314064] bind     /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3 (usb)
KERNEL[325.337392] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0 (scsi)
KERNEL[325.337466] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0 (scsi)
UDEV  [325.338773] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0 (scsi)
UDEV  [325.340412] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0 (scsi)
KERNEL[325.388105] add      /devices/virtual/bdi/11:0 (bdi)
KERNEL[325.388215] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/block/sr0 (block)
UDEV  [325.388841] add      /devices/virtual/bdi/11:0 (bdi)
KERNEL[325.389407] add      /kernel/slab/bdev_cache/cgroup/bdev_cache(310:systemd-udevd.service) (cgroup)
KERNEL[325.389936] bind     /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0 (scsi)
KERNEL[325.389997] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/scsi_device/14:0:0:0 (scsi_device)
KERNEL[325.390106] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/scsi_generic/sg7 (scsi_generic)
UDEV  [325.390135] add      /kernel/slab/bdev_cache/cgroup/bdev_cache(310:systemd-udevd.service) (cgroup)
KERNEL[325.390209] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/bsg/14:0:0:0 (bsg)
KERNEL[325.432910] change   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/block/sr0 (block)
UDEV  [326.956962] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/block/sr0 (block)
UDEV  [326.958339] bind     /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0 (scsi)
UDEV  [326.960110] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/scsi_device/14:0:0:0 (scsi_device)
UDEV  [326.960752] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/scsi_generic/sg7 (scsi_generic)
UDEV  [326.962490] add      /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/bsg/14:0:0:0 (bsg)
UDEV  [329.655233] change   /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.3/1-7.3:1.0/host14/target14:0:0/14:0:0:0/block/sr0 (block)