Customizing html code for attachments generated by “Send to editor” button

I really need to customize the html-code for attachments inserted into the post while pressing the “send to editor” button. After digging the code a bit, I found out that it is hardcoded into upload.js script.

I think that it is acceptable to hardcode elements of admin panels, however, not the elements that go to the public side of the site. I looked through the 2.5 code — it stayed the same re this issue. In my opinion, hard-hacking is not a good way to solve the problems. If I missed something, and there is actually a nicer way to customize this code, I would appreciate your tip very much.

Anyway, this thing pretends to be a CMS, so I think such a feature is a must.

Due to recent introduction of Shortcode API and galleries based on it, I thought that it would be ideal to insert shortcodes istead of the html-code, so that will be no problem with JS and the html-code customization for attachments would be possible through Shortcode API.

P.S. I would like to thank developers for their hard work on such i fine free tool. Recently I’ve been into upgrading my site from nastily hacked WP 1.5.1 to 2.3.3, and I was so much amazed by extensiveness of improvements. Go on!