Connecting additional cables to the hub, you mean? If so what you need is the complex sounding "unmanaged gigabit ethernet switch", but in reality it's just a box that connects to one ethernet port and then allows you to connect another four (or more if you buy a larger switch). TP-Link do a decent metal cased version that has four outgoing ports for around fifteen quid, I use one of those. This can be put adjacent to the hub, or on the end of long ethernet cable if that makes more sense. There's no setup or complication, you just plug it in and it works.
The only thing to allow for is that it comes with its own small power supply, so you'll need a spare wall socket or extension for power.
