"Can this physical address be forged with edited firmware ?"
Sure, but the MAC address doesn't cross network boundaries so someone on the other side of the internet will have no idea what it is.
"Will the FCC require disclosure of a device's physical address as a prerequisite to its use in electronic or wireless communications ?"
Um, this already happens but only on your LAN i.e. your DHCP server knows your MAC address. This is necessary to assign IP addresses and keep track of who is who.
