I had been wondering about that same question just yesterday.
First I had quite a few questions about the plugin. From reading previous forum threads I got the impression that it can be difficult to get support for the eclipse plugin.
Thus, I decided to have a look at the plugin internals myself.
Not only did this answer those questions I had, I was even able to identify two bugs in the code within a very short time.
So, I'm asking just like the others: Couldn't you put the code on GitHub?
You got nothing to loose but a lot to win by doing so...