Whilst preparing material for a temp mix I've noticed that LCR is not presented as a layout option for re-rendering. Admittedly there probably isn't going to be a large number of users who specifically require this BUT I've just been asked by a sound-supervisor to supply several different LCR stems for upcoming temp mixes. (I've also experienced on several productions that picture editorial works in LCR too).
Given that we can specify an LCR bed as part of the input configuration, it seems strange that we can't also define it for an output. Hopefully this can be added in a future update ;)