The imgbed plugin removes the need for adding in markdown. You just paste the URL of the image and it adds the markdown on the fly using regexp.
Upload Images to S3
I would love to be able to accept images on my forum, if they were to be uploaded to an S3 bucket.
I will probably look into this for 0.3.1. Also see https://github.com/designcreateplay/NodeBB/issues/563