Just a few minor revisions to the flight dynmics, small tweaks really, but FSX and FS9 do some things differently. Indeed the plane does not leap of the runway, but the initial pull is sometimes problematic. In the original FS9 bird, some minor modification of the very low AOA lift and pitch was necessary to get a realistic takeoff. Part of this is due to the way FS in general treats horiz stabs and elevators, and also prop blast.
A great Milton Classic, glad to see it getting a new life!