Hey Caz - 

This looks great and would greatly save me the trouble of writing such a thing myself.

How hard coded are things? Would it be relatively easy (for someone with coding skills) to add new crops or fish?

(edit)Oh geez. I can code but can't read docs. It's right there in the description! yes!

Haha, hey there! Yep it's set up in a way that makes it as easy as possible for users to add their own stuff to it. :D