It's true that some of us lavish perhaps a bit too much attention on our scans. Technically, so long as they're readable, the main purpose of preservation has been served. Personally, I would never want someone else editing my scans - even though it takes longer, if I'm going to destroy one of my mags by scanning it, I want to also be the one to edit it so I can guarantee that I'll be completely happy with the results. That said, I'm guessing anyone comfortable with allowing other people to edit their scans isn't going to be too picky with the results, so you should be fine with the basic adjustments you mentioned.