While I don't think there is any rule as specific as that in NH, check this out (look at #2):
http://www.wildlife.state.nh.us/Fishing/tournament_bass_guidelines.htm
I fished many many bass Ts. That rule you mentioned was one of etiquette from NH Bass federation / Bubbabassin. Others may follow it as well that have larger tournaments. These are good people with respect for all on the water. I can vouch for that as I used to assist with launching / loading of many boats and we would allow non-T boats to skip ahead as they arrived (in and out).
I'm not sure if mass bass does this as well but they are not bad people either so I'm sure asking the tournament director may not hurt and I'll bet they will oblige.
Just for the record there are another 15 boats going out of silver sands those same days.
