Just a few suggestions - I have been researching Byzantium's position in 1080!
Can the campaign start with the Sicilian Normans besiging the Byzantine city of Bari in Southern Italy? - this will allow the player the possibility to re-write history by preventing the Normans from driving out the Byzantines from Italy once and for all.
Also, the Byzantines should start with Antioch in 1080 - many mods ignore this fact!