Naw, what I meant was more like EasyReply does it, you know? When you click "Reply", and that text field pops up. My suggestion is, that for actual comments this happens as well, just that the text box is right below the picture - no extra browser window, just like EasyReply. When using JavaScript, they can actually make it so the box scrolls with the window, so it'll always be at the bottom, over the picture, when you scroll up - kind of similar like I do it here:
[Link]And that's just the Comment Box I use while devArt doesn't do that. My suggestion to do that is two years old but it was never implemented, in which two years this little application was of great service ^-^ (I don't think it's messy - it's just a float-y transparent text box at the bottom of your screen. you can type text in there, and when you done copy it to devArt, and close the box with the Escape-key)