Hi Sebastian,
you are right, 7.x-3.x version of module wouldn't work with web...

Hi Sebastian,
you are right, 7.x-3.x version of module wouldn't work with webform-4.x as expected. But you can try 7.x-4.x version (which is normally working),
which is still under development, but you can try and post issues, if you face any with that version.
git clone --branch 7.x-4.x http://git.drupal.org/project/webform_features.git