Would be nice to have it in a future WP release.
it would be nice if I woke up everyday with an endless supply of money.
There's a better chance of my wish happening than yours. Your asking for something that's nearly impossible. Files can be edited. end of story.
You (generally speaking) want to share a theme, than you probably need to be prepared for folks to pick it apart, and remove crap. It is, after all, sitting on their web space. And if thats a problem for you, dont share it.
Im not debating the good or bad of that, just stating reality.