Summary
Report Commander does not allow you to specify printer settings (other than selecting a printer) when printing a report, due to limitations of the Crystal Reports runtime components used by Report Commander. If you need to use special printer settings, you can accomplish this by creating a new printer definition that uses the appropriate settings.
More Information
To create a printer definition with the correct settings, open the Windows Printers and Faxes folder, and locate the printer you want to use. Make a note of the configuration for that printer definition, then create a new printer item for the same device, using the same initial settings. Then modify the new printer definition to use the settings you need. For example, use the Printing Defaults button on the Advanced page to set the paper source, duplexing options, print quality, or other options.
Now when you print the report from Report Commander, specify the new printer name you have created, using the "-printer" command-line option for Report Commander.