A request for a mod that makes it so that the maximum skill level you can get from books is half your int while reading, rounded down.
So, if you have 6 int, you can’t gain exp for reading a book if your skill is 3 or greater, but if you have 20 then you can go up to 10.
You can still, of course, gain exp by doing the skill normally and leveling it up. You just can’t sit down in a hellfortress reading books till you’re level 10 in everything unless you’re also sitting on a pile of mutagens and meth.