This is just a suggestion, and if it isn't something that other users would find useful, I wouldn't ask Brad to implement it. However, here's what I have in mind...
When you click on "Edit This Comic" you get your existing comic come up in the editor. When you make your changes, the only option is to update the comic in question. Now, it might be nice if there could be another button called "Save As New Comic" which would mean that new comics could be made based on the templates of old ones.
Often, my series comics (like "Life In The Office") use similar characters with similar backgrounds - usually it is just text that changes. It would make comic making a lot simpler (at least for me in these instances) if I could just bring up an old "Life In The Office" comic, modify it and save it as a new one.
Does anyone else think this would be useful? Would it be hard to code, Brad?