I would argue that dynamic shadows are very important to the game, and could be fully adjustable for those players with extremely old PCs. PZ is all about a real-world scenario, albeit highly unlikely, in which the player is required to eat, and drink, and sleep, and manage just about every other real-life malady. Dynamic shadows would add so much more to that realism. I would also be very surprised if most players' PCs couldn't handle at least a "low" setting for these shadows. Even still, there can be an option to turn them off if their PC is more than 4-5 years old. That's the great thing about the PC Master Race, we can adjust settings to our liking.