Xbow Cart
Places a TNT cart and sets it off with a crossbow shot through fire.
Turn it on while looking at the floor. It places a rail and a TNT cart there, lights a fire between you and the cart, then shoots a loaded crossbow through the fire so the burning arrow sets the cart off. It needs a rail, a TNT minecart, flint and steel and a crossbow loaded with an arrow, and turns itself off when it's done, or after 4 seconds if a step fails.
Switch delay
Ticks between each step.
Silent aim
Shoot along the aimed rotation instead of where you're looking.
Silent aim fov
How far from where you're facing it will aim.