ORIGINAL: Breca
Manual results is an interesting idea, perhaps most fitting for a Napoleonic or WWII type game, where there are many alternative battle systems covering essentially the same units. Sovereignty is its own world with its own history. Each realm has its own unit types. Each unit has its own Purchase and Upkeep cost. It would be hard to find a way to simulate that in another combat system, and not break the balance in the Sovereignty economy.
What I could see as an option in Preferences is an option to auto-resolve all battles. Some players may wish to simply play the Campaign Game and not get into all the Tactical Battles. Total War had an option like that. I actually used it, since I personally don't enjoy RTS battles. We don't have an RTS, but players may wish to play a faster paced game on the campaign layer only. It wouldn't take much to give them that option.
Breca
I understand what you are saying yet the concept of allowing manual import of results would be something just assumed to be left to the players to devise a third party way of "fighting" the battle. If they "break" the balance of the campaign that's something they'd need to tackle on their own. Just looking at the vast amount of say TT miniatures gamers blogs and web sites, there is clearly a need for a computer strategy game that can allow them to put context into there miniatures battles. There are a few indie "computer moderated campaign builders" out there, but they are very limited in scope
Anyways, I'm no programmer so what from my perspective would be a simple thing to add as an option might be actually quite difficult and from a production standpoint, Im aware that something wont be added if there is no real indication that this is a must have from purchasers.
Hopefully save game files can be edited to adjust results from battles fought outside the system [;)]