For a description of all the features that are available with feature levels 5 and 6, see the IBM Rational ClearQuest and ClearQuest Release Notes for versions 7.0.0.0 and 7.0.1.0.
You do not need to move from feature level 5 if you do not want to take advantage of all the features contained in version 7.0.1. Some of these features, such as the increase in record IDs and enabling UTC timestamps, can be manually enabled with feature level 5. For more information on enabling these features, see the IBM Rational ClearQuest and ClearQuest MultiSite Installation and Upgrade Guide for version 7.0.1.