Yes, the Neural net is the only really unique tech in those "special" techs that come from ruins. I'm inclined to move it into the Psychic racial tech field anyway, as it seems to fit perfectly with that ability. Psychic and Temporal need some extra things to make them as worthwhile as Organic and Crystalline. I've changed the massive shield depleter and ionic disperser to fire every TEN combat rounds so you do get more than one use per combat. Otherwise, the standard Versions are much better deals. Even as it is maybe I should reduce the fire delay even more... hmm.
You can invent new "unique" techs, of course. I have invented several but I keep deciding to make them regular techs so I can use them when I want to instead of having to wait on luck.
