It's not intentionally left out. Battlemesh is driven by the people who come there and participate, and if nobody is interested in a particular protocol or approach, it will not be set up or presented.

Disclaimer: I'll be presenting cjdns [1], the encrypted IPv6 implementation using public-key cryptography for address allocation and a distributed hash table for routing.

[1] https://github.com/cjdelisle/cjdns