Add another vote for "no burn mark."

I understand where you're coming from, Harmy--trying to get SW as close to theatrical accuracy as possible. However, I think there's an important distinction to be made between the finished, deliberate product and the incidental state of the product upon viewing. Things like wobbly subtitles or other composited effects "errors" were due to technical limitations of the time period--people would have signed off on such things and given it a seal of approval, thinking, "Yeah, this is as good as this particular thing is going to get."

Conversely, something like the burn mark is obviously the result of some accident, and not an intentional part of the film. As such, I for one don't think it should remain in the preservation. It's the same thing as the notion you were playing around with earlier regarding the artificial addition of such things as dust and hairs to the film. Although doing so may have given the film a more theatre-like feel, it wouldn't really be preserving the film per se, since you'd be introducing elements that were not intended to be there by those responsible for making the film.

... just my 2 cents.

Edit: I see Cobra Kai was quicker (and more succinct) in making the same argument :)