Max IPs in a DHCP range for Roaming network?

Setting up an AirPort roaming network comprised of a dozen or so AirPort-Extremes all connected via a Fast Ethernet backbone.
The Master base station has a Public IP on it's WAN side and is Set to 'Share a Public IP address' and DHCP - but it seems no matter which network prefix I choose for the LAN side, I can not create a DHCP range larger than a single Class C. Is there a way to give out more than 254 IPs? Or can you have a single roaming network with multiple base stations set to DHCP?

Is there a way to give out more than 254 IPs?
No, as the "main" router, providing DHCP server service is the limiting factor here.
Or can you have a single roaming network with multiple base stations set to DHCP?
This may be possible, but NOT with the Apple routers. When configured as bridges, as required for a roaming network, both their NAT & DHCP services are disabled.

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