Question about Xiaomi Mi Cordless Screwdriver

No, it is not. You may be able to control it to an extent by half-pressing the trigger, but it has no option of controlling the speed.

No, only the direction can be changed at the rear. The part impresses with its minimalism and compactness, perhaps too tight. I need this cordless screwdriver to drive a hand grinder for coffee, it's great for that and occasionally it also screws in screws, but at a fixed (rather slow) speed and fixed (rather too high) torque.