Sorting the items only happens if they are displayed, so there is no difference between sort- and display-options.
The sort order is as follows:
Sort by access: 1. sort by scope (public, private, protected ..), 2. sort by kind (function, variable, ...), 3. sort by name (alpabetically)
Sort by kind: 1. sort by kind (function, variable, ...), 2. sort by name (alpabetically)
Sort by alphabetically: 1. sort by name (alpabetically)
The alphabetically sort dif not work correctly in all cases in this nightly.
This issue is fixed in trunk in the meantime, so the next nightly should work as expected, and it has an option to display the items unsorted.