So as you know you start off as ''The Empire'' and ''Bretonnia'' While being 1 province of what should be called The Empire and Bretonnia. So you start off really small and have no control on your human brothers on the other side of the borders so when you finnaly have established a stable stronghold, the (for example) west side has been washed with a tide of Chaos that wouldnt have happend if you had control of ostland/ostermark.
So here is a suggestion: have a option to start off a big nation mode wich merges all bretonnian(except maybe mousilon) together, all empires(except offcourse sylvania), all dwarves and all greenskins(that are in the badlands). This could be pretty fun and make for some epic huge battles. Offcourse in this mode the city's just start out as they would in a ''normal'' campaign so there is still some poggression to be had than just make instant top tier army's.
Every other nation such as the different norsca factions should stay the same since they never really worked together and nations as kislev and the border princes are already complete so nothing to change there.
Tell me what you think about this mode suggestion and what you like/dislike/would change about it.