I like my users to be able to quickly create a sibling page of the current page.
Statistically, most people want to create a new page under the parent page/namespace. This is because such parent is often used as a container such as a project or main subject.
The issue with the current Xwiki user interface is that the +Create button always creates a child page of the current page.
First I like to submit this as a feature request (not sure where to do that here) and also, maybe someone can give me a hint how to create such button