We have introduced in build 3180 (revision 8097) UPnP support for ICE. It is not enabled by default to let us some time to test a little bit more. But if you are impatient and have an UPnP router, you can enable UPnP support by editing your Jabber account in the advanced tab (check "Use UPnP" box).
Feel free to test it and tell us your feedback. Enjoy ;).