Maybe it is possible to determine what cache files are involved with a section. So when for instance the forum has its own section the publishing process for an forum entry could clear the cache only for this section.
To keep on dreaming it would be nice to add this section any URLs and the additional pieces of information to reproduce the cache-block key which could be used for explicit clearing from cache. This way the page in another section which shows news about forum entries could be cleared from cache too. Btw. How is this solved on the ez.no site? I cant imagine that every forum entry clears the cache each time for the whole site?
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On publish eZ publish deletes all the ViewCache, however this bad behaviour is fixed in SVN (3.4 stable and trunk) and a new smart viewcache mechanism is added. After this fix only published nodes of the object, parent nodes and nodes of reverse related objects is cleared.
Read about it here: http://ez.no/ez_publish/documentation/incoming/smart_viewcache_cleaning_system