[HiassofT]

A colleague (@hiassofT) tested a DVD drive - on x86_64, so not with a Pi3+ - and eject -t is working fine with recent LE9 builds. He's going to try and find an adapter to test with his Pi3+.

Getting the USB2-(S)ATA adapter working with the SATA DVD drive from my PC turned out to be a bit tricky (it's PS was too weak or broken, had to power the drive from my PC, then half of the time Linux detected an usb storage device instead of an optical drive) but once my RPi3B+ detected the DVD drive everything was working fine:

Ran "eject" on the command line to open the tray, inserted DVD, Kodi detected it, used "Play" from Video->Files->DVDLABEL context menu to play it, and after stopping playback using the context menu to eject the DVD opened the tray, like on my PC.

BTW: tests were performed with build #0520.

so long,

Hias