Randomizes recipes (amount of ingredients and products, crafting time) as well as many other things that can be toggled individually like belt speed, crafting speeds, energy consumption, weapon damage...
it seems i always encounter crashes... than again, i play with a ton of mods anyway, when i enable renai transportation i get a crash. here is the log: https://gist.github.com/LegendaryGeek/c9f515e93d68f11c3598e2689df6ccd4
Thanks for the report, should be fixed now.