I don't know if there is anything you can do to make it like Oblivion given that the combat is pretty much hardwired to the core mechanics of the game engine.
Other than what one poster said, which was to get Oblivion and download Morrowblivion or whatever it was called, is about the extent of it. I think Morrowind's "hit-nothing-two-inches-away" combat system is there to stay.
Morrowblivion won't exactly do much since it was never finished due to Bethesda getting their knickers in a twist about it violating the EULA of both games.