Github repository https://github.com/johnlindquist/open-source-plugins/tree/master/Embedder
John's blog http://johnlindquist.com/
Comments: it could be not images only, but some general one (by file type + define mime type).
Personal comments: this is just a nice feature to have. Current bugfixes first please!
We've gotten various requests like this over the last few months - e.g custom quick fixes and plugins. IF we did do this - it wouldn't be a full on Java extension like Intellij. This has both advantages and disadvantages.
We've already investigated it and it's not much work at all; however, as you already pointed out - bug fixes are a higher priority now.
Thanks for the vote!