That should be rather easy and in fact it's working without issues (I'm using at at several sites as here in germany ISPs have the habbit to force disconnects every 24h. >:(
Configure your DynDNS at services>DynDNS. Make sure your pfSense has the real public IP at WAN and it not natted behind another router.
Then follow http://faq.pfsense.org/index.php?action=artikel&cat=10&id=41&artlang=en
It's open source so you can edit whatever you want. However those changes will most likely get lost on upgrading your system to the next version unless ou cleanly implement this as options in the webgui and submit your changes so we can include them in the official distribution (depends on developers decision though). Other option is posting a bounty for these changes.
It's a standard via miniitx board with vr nics that I put into a dual travla 1U case (actually 2 boards in the same 1U case). It's build from pieces and was not a full system that I ordered.
I updated the machine with the newest snapshot.
It's fixed. I can now ping the gateway from WAN interface on the console. The RRD quality graph is now displaying normal results. Thanks again for the great work!