i’m using a touscreen as a second screen and assign the mixer to it.
works like a charm and makes a big difference in workflow.
watch out for certain types of touchscreens (as the one i bought 
) for live because depending on the type of touch screen you will use they can be very sensitive to environmental interaction
(fly on the screen issue with certain types of touchscreens, interaction with laser, interaction with smokemachines, …°
look here for more info: How can a screen sense touch? A basic understanding of touch panels | EIZO
and here (a bit strange site-layout but reasonable good info) : Technologies of Touch Screen (Features of Infrared technologies) | Touch Screen Museum
kind regards
R.