I noticed that he switches between the keyboard and mouse so fast it seems like he always has one hand on the keyboard and one on the mouse. How is he so fast at switching? For me, touching the mouse is the slowing thing I do in a text editor.
The trick I use is to set the mouse sensitivity low and throw grab the mouse in the general direction I need the pointer to go. Then a switch costs me the time to my hand 20 centimeters.
I don't know the technique in this case, but personally I use a ThinkPad with a mouse on home row and buttons right next to the spacebar. I can go from typing to mousing almost instantly, though I still prefer to do everything possible with the keyboard unless I truly need an analog input device.
