During Q2 2013 we worked on improving the style of the DiagramSettingsPane. It is now mainly consisted of TabControl with 4 separate controls SettingsPaneHomeControl, SettingsPaneStyleControl, SettingsPane
For your scenario, you can simply override a hundred lines of Style and rearrange these tabs (or remove, add new ones). You can find similar approach implemented in our CustomSettingsPane sample in our XAML Git Hub repository.
You can also check out our help article here.
Please let us know if this helps you proceed further.
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