
I believe that the ability to transform was the
soul of the game. this was an early game that
had pioneered the ability to both fly and walk
through it.
so to fly at any time it is possible, provided the area
your character was in was open air, would be a great
thing.
perhaps a lock mechanisim in the programming that recohnizes
which areas or scenes are walk only, or fly.
Alternately, it would be difficult to have the character transform
in every scene , unless it was a 3d game.