As I said, I and he would be fine if it was set on a timer and not just busy work (as I like to put it), it requires a certain hand eye coordination as David insinuated above with regards to smithing or clay working parts and that can put at a disadvantage some players, so having options in the settings would be great, even if the crafting of the item simply took a timer or count-down to create.
This reminds me of another game that I played recently that couldn't be played one handed (I'm often stuck in bed and can only play one handed games) until a modder came along and made the game one handed friendl(ier) by creating a mod that did a whole point and click to move the character (but it was a strategy top down view game, not like this), but point being that it would be nice to have options for those people that aren't perfect in body.
In Minecraft... Yeah, it's passive but you put iron in the oven and it comes out iron bars but it takes time for that to happen, I'd really like to see something similar to that (not the oven but rather the timer) for knapping, and whatever comes beyond that, that which is like Knapping in the game.