I finally figured out how to get a Report's data to be BOTH 'determined at run time' and sort order defined in Custom Query section of the report specs:
1- Define the report
2- In the "Data shown on the report" section:
2a- Click on Run Query / Custom Query
2b- Select BO to look for and Sort Results desired
2c- Click "Determined at run time"
While the radio button options make it look like 2a and 2c are mutually exclusive, they are NOT. You can determine the sort order with 2c and the instances of the BO at run time by selecting 2a.
If this behavior is not by design, please don't let this "feature" disappear in future versions. 😃
Thanks,
Tom