I can speak just for the Unix platforms, but I wonder if it would be possible to provide reasonable defaults in the default zabbix-agentd.conf included in the binary packages?

Just for example, what good is the default HostnameItem, if the default config file included in the binary package sets HostName to "Zabbix Server", overriding the wanted default by its own? "Zabbix Server" is wrong in 99.9% of all cases.

For setting up Zabbix on a new host the first thing I have to do is to comment out all the unwanted "non-default" config parameters and to fix the Include lines. And on the next Zabbix upgrade apt-get complains about a conflict, because the new package provides the same unwanted parameters again, even though I would be fine with the "real" defaults.

Same for proxy and server, please.