The Horatio populations aren't considered separate, so you can't splice conquered Horatio into your own. (From what I've seen). Last I heard, though, there were a lot of bugs with Horatio - conquered populations didn't accept the splices already made into your own Horatio, and if you moved Horatio from system to system, you'd lose the splicing bonuses.

You could make a custom faction with the gene splicing affinity and Horatio traits (but as a new species, too) and splice normal Horatio into them that way.

Horacioception. The universe blow up in a beautiful horatiopocalypse

2 Horatio in the same galaxy can cause a heat death because universe can't handle so much beauty.

I feel like the Horatio in ES2 should be played like the Aliens from Xcom.  Aesthetic based clones scouring the galaxy for more genetic material. 

Nodor wrote:

I feel like the Horatio in ES2 should be played like the Aliens from Xcom.  Aesthetic based clones scouring the galaxy for more genetic material. 

I always play them with the Coneheads and Dan Akroyd in mind. Gene splicing gone wrong at one turn and something really funny come out.