Thank you very much zilog for your reply.
I already tried to just turn off all shields you mentioned but noticed then there was a lot of network connections still originating from a couple of background processes.
I understand this is the company policy not (or no more) allowing to turn off these processes. But as far as I know, mac users don't like so much to be forced in one way or another, so I am.
I am sure leaving this choice to the users would help the deployment in the mac community of this otherwise excellent software.
Thank you again for your reply.