Hi. Ok, so there's no bug.
In the future, I may add the possibility to enabled FOP from the outside (well from a limited list of hosts). The main problem is that it's not as easy as allowing /freepbx/panel. You also need to open another port (TCP 4445) so the flash applet can talk the the FOP server. This communication is not encrypted, and may be a security risk. Waiting for a solution to this, I recommand using a VPN to control FOP from the outside (either the built-in PPTP VPN or using OpenVPN).
Cheers, Daniel