Hi,
I would be interested by this mod if there was an option to toggle that only for hand crafting, so it is not entirely disabled but only used when totally stuck without assembly machine.

Sorry, that's not really what this mod is about. But it looks like this one might be worth checking out? https://mods.factorio.com/mod/NEW_NEW_Custom_Hand_Crafting_Speed

(another option would be to make your own mod; essentially you would download my source code to %APPDATA%/Factorio/mods and then remove the lines you don't want; see https://wiki.factorio.com/Tutorial:Modding_tutorial for more info)

Thanks :-)
This is more a question of time about modding, I know I can do it... I'll check the other mod also.