Do you mean you want to sort the pages by title, as it is possible with the Page Tree Macro? That would indeed be a useful extension. Please follow the progress of this issue. For other feature requests please report them here: https://bitbucket.org/simplenia/spacetree-for-confluence/issues
The spaces should already be sorted by name:
The pages are currently sorted by position as default. If your pages have been ordered manually, it will respect the defined order. Otherwise the pages will be displayed in the 'natural' alphabetical order.
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