Two issues here.When playing as an Indian ruler in CKII, I noticed that I used my Dynasty's CoA as my flag instead of the 'standard' flag assigned to the title. Wouldn't it make more sense for the lords of Westeros to also use their dynasty's CoA as their flag? And is it even possible to mod this?
1) You realm would be named after your dynasty eg: The Targaryen Kingdom, The Baratheon Paramouncy, The Reyne Lordship
2) It would make all the amazing coats of arms rendered pointless.