Because of issues in the past, I stick to FAG transfer guidelines. If the person you are requesting is not direct line within four generations I will not transfer that memorial to you without VERY good reason. I am not unreasonable, but I don't appreciate the games that I have been subjected to. If you are unaware of the guidelines, please consult the FAQ.
If you wish for information to be changed, USE THE EDIT TAB ON THE MEMORIAL. If I don't immediately get to one of your requested edits, it's very likely due to the fact that I'm researching your suggestion. HEADSTONES ARE NOT the be-all/end-all of proof. If you are sending me an edit that contradicts the info I have posted already, based solely on the information on a headstone, then just don't bother, because headstones have notoriously variable accuracy. Therefore, if you are sending me an edit, please check PRIMARY sources (birth, marriage, death records, etc) before sending the suggestion.
Some of you aren't getting the message. If you want information CHANGED (as opposed to added), then supply me with a primary source document showing that your information is correct. If you simply provide me with a headstone picture or no documentary source, at all, then I will add a message in the bio section explaining that there may be a discrepancy, but I will maintain the memorial with the information I had originally. As we all want to make these memorials as accurate as possible, my request for documentation for changes is not unrealistic. And again, headstones are not primary sources.