Wireless Access

When creating access rules, I can't find documentation with definitions for options like:

To AP IP

To AP IP all

To AP Network

To Conductor IP

I'm creating a guest network, but DHCP is bridged, so I need to allow DHCP to the gateway of the WLAN. There is no Gateway option, and I'm not sure which of those options accomplishes just that. I can't specify the IP as this WLAN config will spread multiple networks.

I also don't want clients on the network to be able to access each other.

You allow DHCP, not to the AP network but just in general.  You have to allow the broadcast to happen so that either a local DHCP server or  DHCP relay can happen.  What you want to prevent is allowing a client on that wireless network from replying with a DHCP offer.