Detail vs. Summary View
Can you save which format you want the report to run in as default - summary or detail?
Rephrased: If you want summary view, can you click "run" button be always summary? so you don't have to go into drop down menu each time
Re: Detail vs. Summary View
If you remove all of the fields from one of the views, then the other view should show up as the only available option. E.g., if a report does not have any fields in the detail view, then run summary report should appears as the default option on the reporting homepage. Does that help?