"Nationalism" aside (yes, I'm a sardinian and that for sure will only detract from the point), imho the actual representation of Sardinia leaves vast room for improvement.
Right now the island is represented by having Karali (a punic commercial port, where most of the island trade passed through) as regional capital and Olbia (a former greek trading settlement IIRC, please correct me if i'm wrong) as docks.
I'm fully aware of the settlement limit and the RTW engine limitations for such a representation but there is serious room for improvement.
First of all, at game start Nora was the punic administrative and military capital for the island (http://www.isolasarda.com/nora-storia_e.htm I apologize for the shoddy link but I'm sure you will find confirmation in more academic sources), while Karali was the trading hub.
Olbia was a smaller port and while still important served no inland trade to Karali.
Between them there was what the romans called Barbagia, the wildest part of the island populated by various independent tribes.
While they were relatively friendly (used as a loose term) to the carthaginans nevertheless there still was extensive raiding going on and no major merchant route ever passed through their territories.
In fact, reading about the first punic war in Sardinia you can find that Olbia and southern Sardinia were in fact two very distinct strategic theaters.
While the romans counted on capturing Olbia to help them establish naval supremacy over the thyrrenian sea it never was considered a serious base for inland expansion.
Another factor that should be counted for the inclusion of a 2nd settlement is the native population.
Carthage never completely controlled the interior of the island, although after the 5th century their relationship stabilized reasonably enough to quell most of the endemic conflict (although the balares and other sardi pelliti tribes would keep raiding the southern settlements from time to time) the mountains and central Sardinia in general was still under the nuragic culture.
Rome itself didn't conquer the island swiftly.
While the mercenary rebellion made the punic settlements a relatively easy prey the nuragic population was not tamed in any way and rebelled often with the major uprising in 216BC where a coalition of nuragic tribes supported by troops from Carthage fought the romans in a large battle.
After that guerrilla warfare continued for more than a century, with the last pockets of resistance subdued in the early imperium, with Cicero describing the nuragics as "Sardos Venales", referring to the fact that they made worthless slaves, ready to kill their "owner" at the first chance.
In this Sardinia had many parallels with the conquest of Iberia.
Possible candidates of an interior settlement could be Macopsissa (modern Macomer), Nukor (modern Nuoro) or some more coastal settlements like Tharros or Turris.
Finally, here's the best example of nuragic civilization in Sardinia, the complex of Su Nuraxi: http://en.wikipedia.org/wiki/Su_Nuraxi_di_Barumini
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