Should Lemmy have a verified user marker for members who are of importance to any given community?>
No, everyone is equal here and I want to keep it that way. I don't want this to be twitter.
Are there any other options to protect users against nefarious persons playing impostor?>
You mean besides the one where you just successfully figured out the person was legit through verifying them?
No, it should be up to the community mods to verify someone is legit not the app itself.