Speaking of complicated, with all my worries about DV artifacting, I've decided to let this one encode for another day and try out some new tricks on it.
Nattress has an FCP plugin which is supposed to remove most DV artifacting, or at least greatly lessen it. This might result in a much better looking version of the Luke/Vader duel and other bits I've been worried about the artifacting in. It takes forever to render, but I'll let it run today and see how it all looks.
It's supposed to work by intelligently smoothing out the color information and combining it with what it can glean from the brightness information.
Nattress also has some decent frame rate converting plugins which I'm trying out on other projects.
I have also been a bit annoyed by some artifacting in the edited scenes that resulted when I shrunk the film from dual to single layer so I'll be playing with lowering my encoding rates to make the shrinking less necessary, or perhaps shrinking the main feature by itself before using it.