Allow the use of Special:Block/User selectively, so that it is possible for sysops to block a a user from editing in a specific namespace (or a set of namespaces), but not all namespaces. This would replace the current usage of edit filters, making it simpler to apply partial blocks.
This feature was requested after a discussion between Portuguese Wikipedia users. There was full approval of the local community for enabling the feature on ptwiki once it is available.