Use a device over SSH?

SSHFS does not work that way -- it handles files, but not devices. Everything is a file, but there are many types of files, including: regular files, directories, symbolic links, sockets, character devices, and block devices.

% ls -l /dev/sda
brw-r----- 1 root disk 8, 0 Oct  9 20:59 /dev/sda

The letter b indicates this is a block device. These types of files support ioctl in addition to the normal read and write functions. The purpose of ioctl is to allow a way to do "extra" operations to the device. These operations are different for each type of device: a DVD device can open/close its door, but an ethernet device cannot.

This is why the SSHFS software cannot make device files available over the network.

You will need a different system that is made for this purpose, something like webCDwriter.

If you want to remotely access a block device, there is such a tool called 'nbd' (Network Block Device). I have used this in the past to clone a harddrive using dd if=/dev/nbd0 of=/dev/hda with reasonable success.

However, I doubt this will work for optical drives.

I think you'd be better off running the burning software locally on the remote machine (say with X or VNC), and have it pull files using regular file sharing mechanisms like samba or NFS.

Linux/UNIX are not Plan 9. "Everything is a file" doesn't mean that they're all the same sort of files. FIFOs and device nodes being prime examples.

No, you cannot do it this way. My recommendation would be to use a virtual writer (celebron writes to an image, .iso or other) and pipe that to cdrecord over ssh.