FE_Hoppy, I have just re-read my FCOM. No way is explained to turn off the SATCOM. Yes each ACARS is customized to an airlines specs. I have carefully read through all I could find on available specs and it did not appear to offer downloading of flight plan data to the airlines ops. Yes, we can all uplink a plan.
MAS didn't subscribe to ACARS reports via SATCOM on this plane (expense reasons). But FE_Hoppy indicated in an earlier post disabling ACARS comms was about 5 keypresses on the MFD though (MODE>COMM something something)
An ACARS contract can be set up so that a Waypoint Change triggers an ACARS event report.