You may be able to make those settings by the Meridian Control App. Unfortunately I do not currently have a MC200 on hand to verify and the user manual is sadly quite brief. You can however set EBA (and EBC) off on relevant Meridian products via RS232 and a terminal program.

Same can be done with most SpeakerLink devices. Once enabled on the M6 it should stay that way until you go back and disable the function.

Control:PC is already on the MC200 for download. It can be accessed from the MC200 web interface.