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Apple has their own Proton, called the Game Porting Toolkit, and it works well for games that don’t need a launcher & are mainly played with a keyboard and mouse, but I’ve found that game controllers don’t work very well with it.
There’s also MoltenVK, which is Vulkan for macOS, and DXVK, a DirectX-to-Vulkan-to-Metal layer that was used to play some Windows games on macOS before the GPTK came out.
Character speed control is even older than that; many of Sierra’s games in the 1980s/early 1990s (like King’s Quest, Space Quest, etc.) had them. Adjusting them made some of them even easier, because it didn’t affect enemies, allowing you to easily evade them during chase scenes.
I can only think of a few games that have had customizable difficulty. The problem with them is they complicate the user experience, and most people would rather not tinker with them.