This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
When you press Ctrl+R (at least with the default keyboard shortcuts) it lets you rename method parameters by changing the name in place. However, it does not rename javadoc @param tags for that parameter. When you right click on the parameter and go to Refactor > Rename... and rename the parameter using the "Rename Parameter index" and check the "Apply Rename on Comments" check box, it does rename @param tags.
WORKS in 6.8 RC1.