Why does your blind decker not have cybereyes? O_o
For Gangers, as long as they are using image links / smartlinks, he'll have something to do. Edit file, blind them. If he's smart, edit file to just shift the image a few feet to the left or right, to make his hack not obvious. Ghouls and people without ware are harder to handle. He either has to have a non-hacking skill at that point or you need to give him his own sidebar combat during it. Bonus points if you make the time matter. Alternatively, you can dress it up with the scenery. Maybe they're in a construction site--suddenly he has a whole bunch of power tools, drones, and trucks to hack and ram into ghouls. Surrounding cars, in general, are weapons. Cleaning up the trail by editing the PCs out of nearby cameras can be a thing as well. Maybe Hack the local AR to keep civilians away from the ghouls. If he's looking at the Matrix, he'd also be aware of any incoming devices (i.e. people) well before the other PCs would. Well, maybe, but I'd make sure he knew first in this case.