OpenDNS filtering doesn't work on IPv6, at least for people identified by
their IP address, so there should be a simple way, even if it's not directly
in the GUI, to use only IPv4.
A plugins.enabled file is required for plugins to be enabled.
The content of that file is concatened with optional plugin-*.enabled files
in order to build the list of enabled plugins.
Using shell globbing for that is utterly disgusting. I couldn't agree more.