I think its very important to have a tool in the forum where the community can up-down-vote pro/contra arguments and add new arguments. This would help the community to make informed decisions.
Perhaps even a separate app just for proposals. So you have proposals and you can up-down-vote them and you can click on them and see the different pro/contra threads within the proposal. Each pro-contra argument can have its own thread as well where this specific argument can be discussed.