My b2evolution Version: 2.x

Hi,
Somebody know if I can configure b2evo to write to a Master Database but read from Slave database.

I need to configure a web farm with a load balance, so I need this schema (write to master, read from slave). Is it possible? How?

Can I overwrite inc\_core\model\db\_db.class.php DB class to do something like this: http://svn.wp-plugins.org/hyperdb/trunk/readme.txt, http://svn.wp-plugins.org/hyperdb/trunk/db.php?

Thanks a lot.