The problem with this is, if we were to get things in UT 2004, that would mean we would need to rig things twice rather than once. Which, I feel, is a lot of unnecessary work. On the other hand, we also don't have very many weapons/vehicles done.
However, what is possible is making mutators for UT3... that way we dont have to rig things more than once, and by the time it comes out we'd have some more finished content.