Hi,
first, congrats for this excellent firewall !!!

i made a m0n0 firewall with WAN, LAN, DMZ.
My WAN is a PPPOE connection, and my provider provides me a public 
subnet xx.xx.xx.192/28

So, i configure WAN -> PPPOE ( i get on connect xx.xx.xx.xx/32 )
DMZ -> xx.xx.xx.193/28
LAN -> 192.168.2.12/24
*
Check "Enable advanced outbound NAT"
made a "outbound mapping"
    source: 192168.2.0/24
    dest: any
    target: blank (I presume it is my wan ip *xx.xx.xx.xx/32*)

*and rules are:
(proto - source - port - dest - port)
WAN interface:  * - * - * - DMZ - *        
 (no filtering for testing)
DMZ interface:   * - DMZ NET - * - * - *
LAN interface:   * - LAN NET - * - * - * 

It works fine !!
My question is simple:
is it an other way to made PPPOE connection with multiple IP to work ???
is it possible to use the WAN card to assume my public range 
(xx.xx.xx.193/28) and let DMZ in an other subnet (10.10.10.0/24) with 
NAT Inbound ???

thanks in advance !