LimeSurvey allows for the creation of security groups to manage permissions on surveys. If using Active Directory for authentication, it is likely that one would also want to use Active Directory security groups in LimeSurvey in place of (or in addition to) the built-in group management. Because this feature does not exist, I find that I'm creating and maintaining identical group memberships for the same list in two places (LimeSurvey and Active Directory), which is more time-consuming and more error-prone.