I think Alien's theatrical cut is perfect as is, but if you feel you can improve it, more power to you.

I am, however, very interested in a "Revisit" of Dune. There are a lot of edits out there that seem promising, but the one thing every editor seems too lazy to do is to rotoscope the Fremen's blue eyes in the reinstated deleted scenes, which really takes me out of the movie every time it happens.

And if you could get rid of the damn Weirding Modules, that'd be great as well, but I doubt it's possible.