Currently, corn is one of the easiest crops to grow in bulk. It functions like 2-blocks of extra nutritious berry bushes, in 3 blocks of height. However, corn plants, in general, only produce 1 harvest per plant, as each cob takes almost an entire growing season to produce. To represent this, I think the right-click harvest of a corn plant should be removed. You should have to break the stalk to harvest it. However, corn is a more useful plant than it currently is in the mod. Animals are frequently fed on the wasted byproduct stalk(and some types of corn have the entire plant be uprooted without any processing, simply to be fed to animals).. And so it should be usable in place of wheat in breeding animals.