Well, the biggest difference that makes TV so much less like film in look, is your frames per sec.
There are After Effect Filters, one called magic bullet which retails for 1,000 lol, that among other things can accuratly change the picture to even get film grain in it but more importantly can lower your frame rate to movie level.
24 fps for a movie.
29.97 for tv.
That'll be what you raelly need to try and adjust.
To my knowledge there's no way to really do this in FCP4.
*also, just a note. on a high end G4 it takes 10 seconds per 1 frame of rendering using these magic bullet effects. Its high quality stuff, but definitely want a server farm hehe.