I didn't plan to continue this project, but due to popular demand (well, not really, but I'm easily impressed) I've worked some more on it. Nothing big, I mostly implemented some missing GUI stuff.

I've uploaded the new version to my webspace. Check the "Treibjagd" item in the menu to the right.
There's also a new repository for the source at http://repo.or.cz/. I don't know, after a few months with git I'm almost allergic to Subversion.