As a user with wide publicity I can't just afford just to block conferences altogether or limit them to friends only.
Feature exist in LL, Firestorm and Alchemy. Singularity behaves like a viewer from five years ago, by opening conference every time someone talks in it.
Not sure what exactly what you are talking about. What feature is that? What behavior would you expect to have with conferences?
@Shamara Henley conference shouldn't be reopened if creator was muted... Currently it does on every message posted on that conference or on any other conference created by blocked user if they added you. It's currently a fad way to spam\troll people in SL, because some viewers still do ignore mute state in that case (like Singularity, but mostly that's mobile viewers)