I've mentioned elsewhere the idea of a moon in the night sky to help tell time like the sun in day time. Add phases to count the months and even tie in to the weather in seasons. A darker night during new moon phase could even influence combat attack planning. I'd also like to see more forms of wildlife than just deer. Maybe something a little more ferocious like the rare appearance of a bear or something that might put up a fight or cause harm to unwary travelers. Could have more meat or furs could be tax commodity. I've trapped a few deer from time to time. Doesn't sound too complicated, bears as npcs?