PM privacy is not per topic the way topic privacy is, it is necessarily per message because of things like bcc and of course whether people have deleted their message or not.
When we unite against a common enemy that attacks our ethos, it nurtures group solidarity. Trolls are sensational, yes, but we keep everyone honest. | Game Memorial
Well, I was thinking mostly about how to show the data, and then thought of doing a 'special' topic type internally (remember my floating topic concept, uh..? ;)), and then you came and reminded me it wasn't exactly possible... :P
Actually it does make a lot of sense if it's controlled by the board itself rather than anything else - keep privacy at topic level but make everything else board level for presentation.
The biggest hurdle then actually becomes performance management, right now the board access setup is a performance bottleneck if you have too many boards. Need to figure out a way of fixing that.