Road hog 4 info

Hi,
I have to know some info about the Road Hog 4...

I see that there isn't the trackball on board ... it's possible to use an external usb trackball? HES have a specific one?

For my work I need 12 dmx output ... I see that the console have 4 on board and up to 8 universes of DMX 512 over ArtNet or sACN ....
with a console + dp8000 I can use 12 DMx output? (4x internal e 8x dp8000)?? or more?

How many external touch screen can I use? HES have specific one?

Thanks
:):):)