Yes. You can use a touchscreen with Alcorn show controllers as long as you can customize the RS-232 string that the touchscreen sends to the controller.
For the V16 Pro/V16 Pro show controllers, you can also use our Touch software to design creative and useful screens for control or monitoring. You can also use our ShowTouch rugged touchscreen hardware.
http://www.alcorn.com/products/showtouch/index.html