Opened a pull request : https://github.com/xwiki/xwiki-platform/pull/2893

> Also some padding/margins around buttons seem weird and need to be checked

Tom Weise Can you be more precise about this? I assumed you talked about the dropdown buttons which are in a dropdown themselves. They were positioned after the subsection link, I moved them to be absolutely positioned on the top right corner of the subsection header.
If that's not close to what you meant, I need to update the pull request.