Have an option in Report Options to modify report format.
1. A new tab "Report Format" which can provide the option to generate report in default mode (I call it vertical) or customize to generate in horizontal format.
The Report Format tab can have defined set of options for user to enable in the report. The horizontal format would look like something similar to as shown in the attachment "Report_Horizontal.jpg".
2. Have a checkbox to generate report in Horizontal Format on the "Contents" tab. When selected the report will be generated with the similar table columns shown in the attachment "Report_Horizontal.jpg".
I'm considering this complete by the introduction of the "Stylesheet" report option, that lets you choose between horizontal, vertical, and expand stylesheets for ATML and XML reports.