it would be nice if subtitle could render text in
non-square pixel aspect ratios. this would help with
D1 (1.067:1) and D1 anamorphic (1.422:1) video, as well
as custom footage.
it would also be nice if antialias could be optionally
disabled. this would only really be useful for
simulating subtitling in DVD authoring packages (namely
DVDmaestro, and possibly Scenarist), so it's by no
means a pressing issue.