Yep you can simply select the line-in input via a single driver call.
Matt Sonos driver is great! A real break through and a very useful driver.
In regards to line input I think it is missing the functionality to add the line input of a different zone. Eg. Play the line-in of zone 1 through zone 4 speakers. (can be done with controller).
Last night I easily setup a CBUS DLT to control sonos... play/pause/volume/next/previous by triggering a cbus driver event that runs the associated sonos macro driver command...
Any idea of when official release date is?... reseting xp8 every day