I think you misunderstood: the settings in question are in Quicktime, not FCP. Someplace in preferences, I think. I've never had to adjust mine -- if it ain't broke, don't fix it, right? Thus, I'd have to search, too.
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Not sure if this will help
But if you open quicktime - preferences - general
at the very bottom check the box that says:
"enable Final Cut Studio color compatibility"
I did this in Quick time 7 an the changes seem to have transferred over to quicktime X
Now my time line seems the same as the output