No need for mod to change that. Find hero.txt file in your game/sessions,mod folder(mod you curently playing, if you change modes you`ll need to change this settings in all hero.txt).
Open file and find book=xx, xx is number of scrolls you can carry around. Set it to whatever value you want. Since there is 3 hero class, set this for all of them, warrior/paladin/mage. Only problem is you need to start new game for this to effect (i think).
That`s it, go wild
