About the bug you mention above, Guillaume, there is a fix for it that will be part of the next OS release.
What chaosmoon suggests just above would work in principle: the last sentence I am not fully clear about though: you mean the mutestate of the currently playing page of a cluster will have carried over to all pages in the cluster, and hence becomes the "master" for the cluster (rhyme not intended). That means you lose any mute configurations you may have in some pages, right?
In principle this can be good or bad – you just have to make sure you arrange your material accordingly, or things out of your control will happen.. any other ideas?