Thanks for the update Mitch. Hopefully whle that issue is resolved, the ability to change the precendence or the sorts will be added.
Duncan, I really needed to control this as well. There is a work around if your willing to hack the stored procedure.
Goto: <databasename>\Programmability\Stored Procedures
Modify: GetDocument
The last line states 'Order by Documents.Title'
Change that to 'Order by Documents.SortOrderIndex'
This should resolve your issue.
You can modify the Order By to fit your sort needs. For Example 'ORDER by Documents.Category asc, Documents.Title asc'
-Jeff