If you're producing a specific crop or item in order to sell for silver, it can get rather tedious to scroll all the way through the Farmer's Market in order to sell it.
Adding a favorite button much like the one in the workshop would allow you to quickly sell those items that you consistently produce for the purpose of selling.
Also, I would quickly like to add that this game is coming along great! It tickles that min-maxing sideo of my brain while only requiring a small amount of critical thinking. Truly a prodigy of a mobile game, keep up the good work!