I personally just want one major thing from the Turkish faction: I want them to have their numerical superiority represented in the game so they are one of the main factions in the game regardless of how the player plays the game. Like for example in vanilla sometimes HRE gets alot of holdings, other times not. I hate it when they don't because it doesn't represent the history that accurately. I know that we make our own history in medieval 2 but some main driving forces should still be there. Maybe we could give the Turks the numbers similar to the Mongol/Timurid invasion, but to off set the initial advantage, give them some sort of logistical disadvantage, large probability of rebellion etc. For the Turk player this will allow them to gain lands fairly quickly depending on what they do, and the real challange becomes maintaining the holdings as it was in history.