You can use quicktime pro and uprez up to a full 1080 if you want to match other footage without rendering in fcp.
There is probably some batch action script out there that allows for this in multiple clips.
QTP is amazingly useful for £20
I was looking for batch action though
Maybe I answererd my own question
import all to FCP, plop on timline hit render, drink coffee, export rendered rushes
Actually I think there is a software called (or known as a) commpressor that does the batch thing..