BM 3.8 installation procedure went well except for schema extension
part which failed for some reason so I had to do it manually later with
success. However, even though I selected all needed proxies during the
installation procedure, I have filters and exceptions in the FILTCFG utility
empty (as NBMRuleContainer also).

I suppose it's because of not being able to extend the schema during the
installation procedure so my question is: how to get firewall configured as
it would be after successful schema extension during the installation
procedure according to the chosen proxies?