Enable voting for all people (also anonymus non logged in) – how to?

Hi Nico,
At the current version of Q&A plugin, we do not support the anonymous post.
Sorry for the mistake and confusion in language in backend setting. The check-box Login registration is to display or not to display the login form in Ask question page only. All the posts require login.
The anonymous feature goes along with Roles in the plugin and we are working on that to make sure everything work properly and hopefully can release in in the next updated version.
As for now, you can go to Site Dashboard > Setting > General and check the box Membership: Anyone can register.
See the screenshot:
Next, Please log in to Dashboard > DW Q&A  > Setting. check the box Login Restriction    Login required:  No anonymous allowed
See the screenshot:
Hope this helps!