But I don't care about instabilities, I want to test anyway!

Well, if you don't mind running software that's not ready for prime time yet, you can contact us, and we might be able to give you an svn account or provide you a snapshot.
You should be aware of the fact that things not only break frequently, but also we might and do change the Quassel configuration and data formats on a regular basis still, wiping your settings, backlog and so on. Also the database schema has not stabilized yet.
After all, there is a reason we don't do a public release yet :)