1. Yes users can edit their ads later.
2. Yes reviews can be moderated and it uses the default Wordpress comment system for moderation.
3. No option on this currently and will require code customization to implement.
1. Can people who submit a listing edit it down the road?
2. You said reviews can be moderated, I didn't see anywhere in the backend where this can be done.
3. Do you have any settings to change the full width?