We currently use InstantForum.NET for our corporate message boards for our trade sites, and we've run into an issue.  Members can change their usernames at will, and our community moderators do not want to have to keep track of this and it is making their jobs too stressful.  We looked through the Admin CP and Documentation, and there is no way to disable this option from members that we could find.

Are we missing something, or is there a fix/update we need to get?  If not, will this issue be addressed in future builds - this is a pretty basic option found in all other forum software we've seen.