In my server plenty real farmers of hemp farms, horse farms, potatoe farms, corn farms, pumpkin farms....
They can sell everything for scrap in bandit town for a prices i set.
So i thinked, what if you add ability for plugin to change prices automaticaly for listed specific item shortnames with min max time range when its change prices and min and max price range.
For example 
short name: "pumpkin",
change price time in seconds
min: "10800",
max: "14400",
random price for item
scrap min: "1",
scrap max: "5"

(hope developer can understand what i mean, would be really cool feature)