What’s legal in the Ssethregore book?

There are lots of way cool abilities, talents, paths, etc. in the Ssethregore book. Great stuff! But as I’m starting to lay out a Ssethric character, I keep wondering, “What parts of the Ssethregore rules can I use?” I’m talking about the crunchy bits, not the history or cultural information.

I assume that everything in the Chapter titled “Codex of Heroes” is legal for campaign play.

How about stuff outside this chapter, like:
* can I play a val’Sosi?
* can I gain access to technomancy?
* can I learn spells noted as “Ssethregore only” or “ssethric creatures only”?

Thanks.