At the moment you will have to handle all of this on your own. Basically you need to attach blobreader functionality to the onpaste / ondrop event to the editor. There is a plan to make an advanced WYSIWIG - but we have a few other things that are top priority at the moment. Maybe late this summer / early Fall we will find time to do it.
Its not exactly trivial, because you will probably also want to upload the image to your server and then return the url from the server. I did some work on something similar for v0.17 - the approach is still the same. The front-end code on that project is GPL, so if you use it you will be bound to retain the GPL license and the JSDoc function headers. If you make adaptations you will also have to contribute that back to utopian-io. Anyway, here you go: