how to make a minecraft bedrock tas???

I see ppl in ssg runs and they can seemingly speed craft a specific amout of an item in a click, without dragging it off the crafting grid. (Example: https://m.youtube.com/watch?v=ciyYvsDS1kI&pp=ygUHTWNiZSB3cg%3D%3D (Start at 0:20)) is there a hotkey or smthn for this? Shift clicking just crafts all of one item instead of 1 or 2, so idk how they do it

I would like to know if theres a client or smthn that works as a resetting mod. I see the rsg runs, and they reset incredibly fast, it sounds like they clicked 10 buttons in half a second. Also the create world menu looks different. If there is somthing i could use pls tell me?