Physical focus?, why not? Options

[wind_in_the_ston...]

You can enchant technological devices. So you could enchant a cyber-arm as a weapon focus, and then implant it to gain an advantage in unarmed combat. Or you could enchant it as a power focus, and then implant it. Theoretically, you could enchant a vehicle as a focus. But what kind of bonus would you gain from attacking with it as a weapon focus? Would you be able to use the bonus dice on a drive test when attempting to hit someone/something? Probably not. But at least spirits wouldn't have immunity to being rammed by that car. ;-)

So why don't we have general physical foci? A sword is enchanted so that you may wield it more effectively. Why not a car so that you may drive it more effectively? Or the obvious item - a gun? Lockpicks? Well... too many individual items. Most such enchantable items will fall outside of the shadowrunning profession. A bowling ball, jugglers' balls, a paintbrush, drumsticks, a violin, maybe skates... As for the bowling ball idea, what's this thing where the focus must remain in contact with the user in order to be effective? The ball's trajectory is set as soon as the ball is loosed from your hand. Would the ball suddenly veer off-course because it left contact with the adept? Same idea for the gun. Why no gun foci? Become one with the gun.

I think this is a holdover from earlier editions, where weapon foci added damage. For this reason when a projectile left contact with the user, it would no longer be active, and would no longer get the bonus. In SR4, the only bonus dice are for the initial use of the skill.

Of course, you couldn't do anything with these foci in astral space. "Sure, you can take your GMC Bulldog focus into astral space, but you can't start it up."

So what do you think? Any reasons why we shouldn't do this? And what a non-weapon physical focus cost?