https://mods.factorio.com/mod/zKenirasRandomRecipes


This isn't quite what I'm looking for. This randomizes the recipes and craft times for the entire duration of the play.

I'd like for each individual item being crafted to pull from a range each time an item is crafted. To build on my example ...

TL;DR
Crafting time variance


What ?
I'd like there to be a slider in the game settings to create and change the variance in crafting time for items so that crafting time will be a range rather than a defined duration. For example, if I set the crafting variance to 10%, the time taken to craft ...