360 design snafu. it's probably inherited from a previous version of the 360 player. i've found similar missing commands from other equipments' remotes that are available w/in the harmony database or by sending logitech support the manufacturer remote codes to add it to my setup specifically. they're really great about it, but it takes a few days or so for them to get to setting it up.
you would add it to any of the harmony remote's hard keys or an 'eject' lcd button just like any other command in their database. and yes, i checked earlier today and it is in the database although i don't have that sony model to test it out.
that i don't know. i'm a panasonic bd player man.