@cliffordbeshers You can if you use Mimi Uploader, or upload the photo in the app/web-interface first, then reference it in your post with the username afterwards. But you probably know this.
@odd Yes, but what I do is wrap an anchor tag around the image that takes you to the full size image. I don't know of any automated way to do that.
@cliffordbeshers I can reproduce this now and I'm working on fixing it. The "_tag" is an internal reference that shouldn't appear like that.