Regarding caster (and I may be wrong, so more technically minded rc legends are allowed to shoot me down) I always thought (and this is going back to my F1 days where it was a good tuning aid) more caster equalled less initial turn in but more agressive exiting corners and the oposite for less caster. If we ever needed more turn in on the F1's we always removed a bit of caster for a touch more bite.
And as far as the roll centre and camber links are concerned, the way Rich said is the way I've always been taught.
