Visual environment indicator in TYPO3 Backend
Speaking from my own experience, TYPO3 backend users might confound backends from different environments.
This can lead to really worse results. Started from flushing caches in wrong environment or even delete pages/content elements.
It would be nice, if there were a visual indicator that help backend users prevent this mistakes. This indicator should be visible in the backend but also in the login mask.
As an example, the header could get a custom backend color, that can be set via backend extension configuration. But this solution will not work for backend login mask.
So please use this issue to gather more ideas.