When I went this past Apirl, we were able to drop the first and last day. Actually, we had different people in our party leaving on different days, so we bought 2 4 day park hopper passes, 2 5day/4night LOS passes and 4 6day/5 night LOS passes.
They were extremely flexible with us. The CM that helped us seemed to be very experienced, so that may have helped.
Good Luck!