The addon has events that can release RUMS (Sultanate of Rum) in Seljuk territory after a given date, as well as release OTTO (the Ottoman Turks). They will spawn as a one-province kingdom when this happens (engine limitation).
A few other muslim realms also spawn this way. No christians are currently included, as realms without assigned provinces tend not to do well at all.
I'm considering a better approach for the three Turk realms though, along the lines of muslim Egypt. Seljuk Turks, Rum, and the Ottomans could all be represented by a single tag (renamed to 'Turks'), just like the Mameluks and Ayyubids are both called Egypt.
//Edit: you may want to take a look at this mod...