So as you progress through the game you will of course come across some well earned septims from distressed merchants, lazy lords and of course the war effort.
So here is my pitch, you earn gold and in doing so the magical faeries(tax and census) record a % of earnings. When your noble warrior is crowned emperor he has the ability to spend gold for repairing roads - x to move speed on roads. Better medical vacinities- % healing over time. Resupplying war effort etc..
Stolen gold and items would be exempt, but perhaps people with bounties would not profit from bonuses. The possibilities are boundless and would add more creativity amongst the community.
P.s sorry for the long post