Yes, the touch screen acts as the "mouse". And, even the keyboard, when front ends like Centrafuse are used. For character input, you can switch the display to a keyboard, and type on the screen. You don't need a separate mouse or keyboard to control all the functions and features of your front end. For tweaking files in the background, tho (like .ini or .xml files which allow greater customization of the front end), you'll need a regular keyboard.
I don't know where you got the info that your alternator is 200A (it's not):
AD244 67A@idle, 130A max.
(Trust me, I know... I put two of them on a LB7 Duramax, a few years back. Dual alts are da bomb... doubles your at-idle output, which is far more beneficial than total max output!).
Regardless, your lights and winch will draw a lot more than a PC will. But, I'd be careful about running everything at once! (especially at idle).
That was the other thing I liked about my Duramax... a simple jumper wire mod on the ECM, and you could enable a "high idle" mode. As I understand it, it's a feature that came standard on later models...
On edit: Waitaminnit... Are you saying you have a 6.0l with a 4l80E in a S10 4x4? Pics, or it ain't real. There's no room in the trans tunnel for a 4l80e, and you'd have to put the transfer case way back almost under the bed to make it fit, because of the length. A 4l60E, maybe...
AND.... an L31 isn't 388ci... it's 350ci. So, unless it's seriously stroked and bored (which the stock casting never would have allowed), I'm throwing the BS flag... 10-yard penalty, still second down.