SlimeKnights/IguanaTweaksTConstruct — pull request #29 by talonos2 (2014-10-19 22:30:31+00:00)
Title: You can use override to specify material XP rate.

Added to levelling logic: Each material now has an XP multiplier, so you
can make some materials level up faster than others. Each material
defaults to 100% normal experience, but can be changed in the material
override module.

You might ask who would ever use this function. I plan on using it in my
upcoming modpack, so there's one interested party, at least. :/