Yes! You can customize standard reports whenever the option to customize that particular report is available. To do so, you need to click on the Customize Report button available in the Report Toolbar.
Figure 1: Customize Report Button
Once the Custom Report Wizard opens up, all you will need to do is drag-and-drop metrics and groups into appropriate slots. After you are done click on Show Report.
Figure 2: Custom Report Wizard
Custom Report Wizard = A Yahoo! Web Analytics term used for a reporting wizard that allows you to create your own reports by dragging and dropping group items and metrics.