Currently the chicken eggs are pretty useless, I have an idea that most people will hate but will make the egg more useful. I think that you should have an egg in your inventory to eggify an animal. When you right click the animal the egg separates from the stack it if it was in one and goes into an empty slot and turns into the Egged Animal. I think that this would be hard to code but it is just an idea. For those of you who dont get it: Stick + Chicken Egg = Animal Spawn Egg
On this other server, it requires an egg and 5 piles of redstone dust to eggify something. But, I don't see any point in adding an egg to an idea that has never required one before. It would be hard to get 60,000 people to cope with the idea and otherwise, not worth it.