There is a no spider mod somewhere on Nexus and I'm sure, more will follow, since you get them for most games, that feature spiders. And yeah, I wish, they would be used less in games.
However as an arachnophobe I, too, am ok with the spiders in the game so far. I use no spider mods in some other games - Skyrim for example, after I encountered my first frostbite spider, I noped out and installed a mod, that changed them to bears.
I'm not sure, If a toggle would be possible though.