Preventing resellers from creating/editing Feature Lists

Hy there! I just noticed that, for whatever reason, all of our reseller accounts are able to edit and create their own feature lists from WHM, which is not the intended behavior for our needs. Which one of the flags available at "Edit Reseller Nameservers and Privileges" locks out the "Features Manager"? All I can find by Googling around is some old threads claiming that this can't be done, but I assume it has been implemented ever since. Thanks!