Hi Thorsten,
first thanks to considering our problem.
We use wordpress 4.2.3 and the latest version of your plugin.
By the way i forgot to mention another issue with the plugin. Just after we installed the plugin due to the php error we can’t access to the details of the articles in our wordpress bac-office. we get a blank page when we tried to created or modified an article.
To answer to your question about Brightoce account. No, we were not able to manage our Brightcove account in the setup section.
I hope all this help you, feel free to ask more question.