The change (if there was one) did not need to be made IMO.
Don, IIRC, this 'change' first appeared during one of the AH2 beta versions.
Initially, the earlier versions of AH2 beta had very convincing ditch models. The planes were severely effected by the terrain. You really had to nurse the plane carefully, down to very low speeds, and had to take effort to stay as stable as possible at the first contact with land.
However, this ditch model had some problems with some planes. Maybe there was a bug with it. Some planes, like the Fw190A-8, was almost impossible to ditch - at first contact the plane would just blow up.. and etc etc..
So, this was patched, but not in the way that fixed the problematic planes, but it seemed like the 'safety limity' of ditching speeds was just altered overall very high.
I always thought that this was just a makeshift, temporary patch until HTC reworked the ditching part... except its been quite a while to consider it just 'temporary'