Resizing video - Quicktime Pro ???

I'm currently working on a project where I have a number of letterboxed clips in iMovie and need to export them to iDVD, but I'd like them to play without the grey side bars which iDVD seems to impose. In other words, to play as widescreen clips with minimal letterboxing on a 16:9 TV, (they are 1:85 aspect ratio so there would still be letterboxed). Side to side they should fill the screen though.

Now iMovie currently won't let me do this. If I start a new project in widescreen and import my clip, it will just put black bars on either side as well as the letter boxing.
If I upgrade to Quicktime Pro, can I crop most of the letterboxed area out, and give the clips a true 16x9 frame by altering the size?

Any help or ideas appriciated,

Thanks