[Mailman-Users] how to implement two custom features?

We need to implement two custom features for moderator functionality. The moderator would do these things before approving a message.

1 - ability to change the subject so we can start a new thread (when the user forgets to change the subject to an appropriate one themselves).

2 - ability to edit within a post to remove objectionable material from an otherwise allowable post.

Any suggestions are appreciated. Our options range from making small changes ourselves to hiring a professional to write custom code. Thanks.