The spacers make no difference to toe, camber or caster. They do increase scrub radius, so there is a chance you'll feel a difference through the steering wheel as the tyres will want to pull into surface ruts and follow cambers more - but how noticeable, I don't know.
The only reason you're fitting them is to increase clearance to suspension components. Others will do this to improve vehicle "stance". Ideally you'd leave everything alone, but the other option would be to fit a wheel with a reduced offset that will have the same effect.
Unfortunately, pre-2000 cars had a greater offset to the later ones, so hence Ali's need to use a spacer to clear the brakes!