Am back and working hard to get v3.2 ready for release. I have added the de-interlace settings and leterboxing as an option. After making the letterboxing change for you the first thing I needed on a show was to stretch the live video Doh...
I found that the de-interlacing settings was not always working on all hardware. Beta 19 now uses a more robust setting but I have not had a chance to test it on hardware yet.