Right, so the script for the players health increasing when the player is running turned out to be pretty easy to get into the engine, balancing things out so that it doesn't become a game-killing advantage could be a touch more difficult - given that I don't know much about the coding environment, but it seems to be a python/C homology of some sort. There's probably heaps of information on it from the carnivores mods as I don't expect it'll have changed much.
As my first time under the hood, I'm surprised that nobody has tinkered with this engine before! It's actually really forgiving
