At the moment, if you have a cluster in place, users are accidentally (or by selecting icon on workspace) directed to replica R on cluster servers S1, S2 or S3. Therefore you can not plan as a Domino server hoster on which cluster server your users will be directed (e.g. if you have 1000 applications). With the new functionality, it would be easier to plan server capacity (e.g. if you can direct user onto cluster server S1 for application R1 and user onto cluster Server S2 for application R2). Additionally (at no cost) soft document locking would be working on cluster server.