Great mod, as a long time fan of ASoIaF I see lots of potential with this.
A couple non-sense CPU related do happen but I guess there is nothing you can do about it (Robb attacking Jon, Stannis forming an alliance with Cersei)
My suggestion with this is, once you are done with the missing civs, to focus the scenario mostly in the war and politics than city founding/wonder bulding.
You could give each faction 5 or 6 cities, disable city building and city razing so the only real way to expand is via conquest.
For example each civ could start with:
Nigth Watch (Jon)
- Castle Black
- Shadow Tower
- Eastwatch-by-the-Sea
- Mole`s Town
- Fist of the First Men (north of the wall...you can make it extremelly hard to keep agaisnt wildlings)
Stark (Robb)
- Winterfell
- Thorren Square
- Moat Cailin
- Withe Harbour
- Hornwood
Arryn (Littlefinger or Robert)
- The Eyrie
- Gulltown
- Redfort
- Sunkenwood
- Baelish Keep
Tully (Edmure Tully)
- Riverrun
- Varamar
- Pinkmaiden
- Saltpans
- Acorn Hall
Greyjoy (Asha or Euron)
- Pike
- Ten Towers
- Banefort
- The Crag
Lannister
- King's Landing
- Casterly Rock
- Lannisport
- Castamere
- Duskendale
- Darry
Baratheon (Stannis)
- Dragonstone
- Storm's End
- Stonedance
- Evenfall Hall (not really Stannis' but was allied with Renly)
Tyrell (Mace)
- Highgarden
- Bitterbridge
- Old Oak
- Goldengrove
- Summerhall
Martell (Doran)
- Sunspear
- Sandstone
- Starfall
- Oldtown
- Sunflower Hall
Targayren (Dany)
- Astapor
- Yunkai
- Mereen
- Vaes Talorro
Citystates:
- House Frey
- House Bolton
- House Tarly
- House Mormont
- Harrenhal (for all the times it switched sides)
- All of the Essos free cities: Bravoos, Lorath, Volantis, Norvos, Pentos, Myr, Tyrosh, Lys, Qohor, Lhazar, Qarth, Yi Ti, Asshai
- Craster's Keep
Likewise you can make the most iconics wonders already in place, Castle Black starts with the Wall, Kings Landing Starts with the Iron Throne and Sept of Baelor, etc.
Of course this would mean having city-states with wonders that are not actually playable. Bravoos would have the Titan, the Iron Bank and the House of Black and White.
Also you can make religions already founded and in place, the north is strong with the old gods, the south with the seven, Pyke being the holy city of the Drowned god, Stannins has R'hllor etc.
That's just a couple suggestion...there are lots more ways to expand this scenario