I would argue that to RedShirt, the creation has to have an intellegence equal to or greater than a trooper, but less than the hero's. (If it is smarter than the hero, the droid is likely to take up the mantle of officer itself).
I also think it should have to be approximately minifig sized and oriented. Since you mention mouse droids, that implies wheels and a low profile. Unless they have jump jets or some other method for getting airborne, they couldn't redshirt and shot aimed above the hero's knees.