Thanks you very much Christian,
I was just working on something like this with HSQLDB. I have put the code in a junit test on my project so that when building the project it checks if the database structure is up to date, if not the test fails and displays the changesets that should be appended to my changelog file. This is exactly what I needed.
So is it worth releasing a new version of liquibase-hibernate extension or should we remove it and explain in the documentation how to do it the way you did? Nathan, Christian, what do you think?