Day visitors are not the only ones to commit the abuses listed above.
A paper pamphlet could be included with the season's pass when it is purchased or mailed to the member. Rather than give a copy to each climber, offer one to each rope team or group leader on significant busy weekends through out the season.
Possibly the contents of such a pamphlet could be prominently on display at the trail end of the West Trapps PA, just over the guard rail to the Nears, or at the foot of the Stairmaster? Titled such as "First Time in the Gunks?" or "Here to Climb?", and goes on to introduce some climber's etiquette, highlight some local practices and expectations. Simple, and not quite in their face.