I've read the comments and find them interesting.  I hesitate to comment but since I've flown in many times, I do have some experience.  The following is a copy of my comments to ATC Oshkosh.  If it can be improved, send your improvements.
               -----------------------
I've flown the approach in a c-150, Mustang II, and a Lancair LNC2 [2 place]since the late 70s.  My good experiences have been when the faster airplanes were headed for 18-36 and the others to 9-27.  Serious problems when war birds or group type arrivals have closed access to 18-36.  [I've been refused 18-36 the last two years in the Lancair...not good]
My solution:  dual lanes down the tracks with the lower altitude on the left side containing the slower airplanes.  The right lane at the higher altitude and directed to left or right 18-36 depending on speed or other requirements.  Stop closing 18-36 for anything except an emergency.  If the warbirds require special handling or the group types, create a window in the notam [say an hour in the afternoon (like a reservation system)].  If they miss the window, tough, and have them join in the standard arrival.  Some suggest letting the 'fast' homebuilts use the warbird approach.  Letting them in the window might work but it isn't a total solution as it does not address those of us that can fly safely at 90 knots but not at 70 which is the common speed I've observed in these many years.
             ---------------------------