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It uses SDP to exchange ICE candidates. At the moment the SDP tries to multiplex video/audio and SCTP (data channel).

Does WebRTC have any sort of extension mechanism whereby I can drop in my own version of NAT traversal logic?

Speaking from past experience, STUN and ICE are OK, but they got the whole process fundamentally wrong. They let the clients drive the traversal process. This is substantially inferior to letting a dedicated mediating server do that instead. I did that with one of my past projects and it helped with connecting peers in a large number of obscure scenarios.

You should hack the Chromium webkit for this.

you can add one or more TURN server(s) into the mix, but apart from that there is no other way using just Javascript.

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