Feature suggestion – opton for front end submissions by users

An option for admin to allow front-end submissions of pros or cons by users (registered or guest). User can submit a pro or con to be added to the lists. Admin can have option to moderate submissions for approval/posting or not. There could also be a duplicate content checker so that as user types it will show if existing pro or con already exists that match for example 3 words or more. And it won’t allow duplicate submissions. A voting system where users can like/up-vote pros or cons and the pros and cons will be ranked by most popular votes/likes.

What do you think? Thanks