Sure thing! Being able to rearrange A/V without having to decode/reencode it is really neat, though. They deserve major props for what they've been able to accomplish so far.
I'd love to see audio editing that happens purely in the frequency domain. It would be almost like lossless editing, as (AFAIK) you'd be tweaking the already-lossy-compreased values, rather than decode -> edit -> encode.
I'd love to see an editor smart enough to edit a compresses audio stream directly…