Seems like the Forest Service trend is to crack down on climbing at Rumney, not the opposite.
I would say that the limited (present parking situation) parking is a good thing. More parking would likely just draw more people, and you would have a crowded lot and cars on the road just like you have now.
If anything, there should be some enforcement of people who illegally park on the road and piss off the locals (which seems to be getting increasingly common). Either self-policing, by forest service, or local police. I for one think they should just ticket and tow anyone that is parked in the road. The town hall is a short walk if the lots are full, and it says it right in the guidebook, so ignorance is no excuse. I love Rumney, and would be very disappointed if access was threated due to people being lazy and thumbing their nose at the law (and plain common sense).