So he wouldn't be able to make a new channel (this seems to be limitations of the ICP itself) however they could use the 'video to one carriage' function and let people know where to listen

He will be able to hack it so he can get it to record without someone physically stood there pressing the record button

Muting isn't possible though they should be able to temporarily break the sound so they can't hear the ICP in whatever carriage they are meeting in