Efesz Servers with mcmmo think has a fishing (job?). You can level up by catching fish basically. If you fish several times at same spot you will be not able to catch fish at that spot. So it says that you need to change fishing spot at least 3 blocks. So I would ask to making autofish to change players direction to one of the other spot possible after spesific amount of succesful fishing in a spot. I have no idea is it hard or not but it would be awesome.