I think this is a good idea.  Although a ton of people love grindingstone because it has a more natural terrain/old school motocross style.  Sounds like they are planning on doing some MX races out there.  I think it would be awesome if they did something like you are talking about a week before the MX race, then afterward they could return it to the more natural style.  I think the MX guys would really be pumped on it.