I agree that the middle of field might be void without a backjudge. But you are at the most 27 yards from the nearest official.
I disagree on deadball officiating, accordian in like you would with 5 or 7 man. Sideline deadball coverage is much easier with 6 man.
http://www.ecac.org/uploadedFiles/Of.../6man82506.pdf
Try this site out for mechanics. ^^^^^