Another small idea I had:
In Messages the ability to send letters and whatnot to allied military leaders, which includes realm military leaders as well as military leaders of all allied realms. (Perhaps this could be limited to military leaders of the realm).
Also the ability to send messages to all allied military leaders in the region, instead of just all allied nobles.
This might help a bit with coordination between marshalls, generalls, vice-marshalls etc. of different realms.
