It would be great if you could direct the produce of your acres. This would tie in nicely with manufactories
wheat-> beer, grapes-> wine, flax ->linen you get the picture. With a one time a year harvest and maybe two times for wheat. With events like good and bad harvest, looting and damage from sieges etc
Also i was thinking as a store of value, gold and silver bars (or bag of gold or silver), with a certain exchange rate. So you dont have to run around with 20k shilingas but you can actually buy a gold bar and put in your chest at your hideout which you can then sell at a merchant for cash when needed.