Those aren't nice ideas to be honest They are exactly the type of stuff some1epic123 was talking about. Just a bunch of PMC trolls either trying to be funny or are just legitimately that ignorant. I have a legit idea for a mod, for I am a coder myself, but I will give you the idea, for I don't have the time to work on something.
Explanation
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Journey to the Center of the Earth Mod
This mod will add tons of different things. If you have ever read the book by Jules Verne you would know what type of stuff I am thinking about. The Journey to the Center of the Earth is where there are volcanoes scattered throughout the map (pretty rare), and there is an entrance at the top that leads to a giant cave system that could trek hours to get through. This cave system will eventually lead to another dimension (the Center of the Earth) In this dimension there will be many different kinds of mobs and blocks.
NOTICE: I checked everywhere, and there is not a mod like this at all. So you would have something going for you. If you PM me, I will give you a list of things that I was wanting to add to the mod.