Sharing settings between servers
When you run multiple IRC servers (in the same IRC network) then it makes sense to put these "shared settings" in a separate configuration file(s) and only put server-specific settings directly in the unrealircd.conf directly.
For example, you could put all the shared settings in a file called network.conf, copy it to all your servers and include it from your unrealircd.conf. Or maybe you want to split them up like link.conf, class.conf, settings.conf, etc.
Even better: use Remote includes so your servers fetch a copy of it by HTTP(S) upon start and /REHASH.. then you only have to update one file, rehash your servers, and the settings are active network-wide.