Sorry, but the new trail still doesn't make the most sense to me, for lots of reasons... we can do better. Maybe. Let's think outside the box a little? 
i think you're "preaching to the choir." all of your suggestions make perfect sense to me (and i'm guessing they make sense to the rest of the climbing community.)
it is not the climbers you need to convince. in my experience with the rumney climbing community, when things need to be done; the core group steps up and produces action.
the trick is to get the usfs and the local town government to "think outside the box..."
warning small rant to follow: in my experience, the people who work for the usfs are well-intentioned and knowledgeable, but they are primarily bureaucrats and actual resource management is secondary. their priorities are 1) to protect the usfs bureaucracy, 2) slavishly comply with federal regulations, and finally, 3) protect and manage the forest resources.
a perfect example of this is when they told mark sprague to stop his trail building work up to the "triple corners/hinterlands" area. the old trail followed a steep drainage gully. with every climber footstep and every rainstorm it became even steeper and more eroded. for years we had talked about how this trail needed to be re-routed and "hardened up" to protect the surrounding area.
the usfs couldn't or wouldn't devote any resouces to it, so mark decided to take on the project by himself. mark did his usual stellar work. the usfs, when they learned of the work told him to stop because of concerns about "rare and threatened species." they didn't send their own trail crew, they didn't even send out a botanist to look at the area he was working in. they just said: "stop...."
if there were threatened plants in the area, the herds of climbers that stumble up and down this gully would surely step on them, but there is no regulation about that.... but there is a regulation about building a trail near areas that may have protected species.
protection of the plants wasn't the real focus of the usfs's action, their onlyl concern was to comply with the regulations.
end of ranti'm not sure it's the climber who need to do better in this situation. my advice: if i you really feel strongly about this, spend your energy bugging the usfs and the town government.
respectfully,
ed e
ps, as to parking situation: if the lots are full, too bad.... go somewhere else. if cars are parked in the road illegally, the local cops should ticket and tow....