Inspiration for this mod came from creating a survival map, intended for multiplayer, based on a set of islands in the middle of the ocean. Each offer their own tier of resources, ect. However, traversing the water is terribly easy with default Minecraft. I wondered if it was possible to change the variable of how much Hunger / Exhaustion incurs from swimming, but not the operation of a boat, which would render boats more useful. The main point would be to keep players thinking before they take action or else they suffer the consequences.
I did a bit of searching, not extensive by any means, and found only some basic information on the wiki.
After finding the value outlined in red, I figured there had to be some way to simply increase this (either through UI or .file editing) in order to yield near sufficient results. Compare the actions listed with their values outlined in yellow, and notice the considerable difference.
If I were able to change the swimming value then difficulty surviving on an island map would be significantly harder, as one would be unable to simply swim to land for more supplies or resources. (In a sense it would a more natural version of SkyBlock, except being in the ocean)
Non-Hardcore Difficulties offer only slight changes to SSP/SMP gameplay.
The purpose of this mod would be to tweak and change more specific variables on the elements of survival.
UI or .file allowing the modification of exhaustion numbers.