There is not much you can control in DHCP settings for Google WiFi. However, I now have the best wifi coverage I have ever had in my house, all on a single SSID (instead if the four I used to have). 90mbps everywhere is really nice to have
.
Google have gone for ease of use for non-technical customers. But, I still would like to see options available for us more technical types. Although, you can reserve an IP address for any specific device and you can set up port forwarding, both of which I shall be doing when I switch the superhub to modem mode later in the week.
Many thanks to those who replied.