Also, for now uploading images to the server is disabled, only the above mentioned types.
If i turn img uploading on and remove the add images button for instance, the process would be like this:
You'd have to upload it either through the icon or drag n drop, and right click on the attachment and past the link into the img_url field that everyone knows, then it would work normally. Maybe it's too much of a chore , maybe not.
If you think the above setup is better than the imgur button let me know.
This is all due to the markdown setup, in the WYSIWYG setup it was automatic.
I'm still looking on how to automate it as it is without anything hacky.
Oh, and it has the same downside of gifs being rendered into static images. At least by default.