In addition to changing roll centre, changing the relative height of the ball studs (inner to outer, and also with respect to the arms) alters the change in camber from rest to compression. "Camber rise" is the common term here. A shorter upper link typically means more camber rise on compression. It does on our cars anyway.
Ideally, you want the camber when rolling to maintain the idea amount of contact patch for the type of corners you are dealing with. And that will change based on your driving style, the amount of grip available and the camber of the corner itself! The higher the contact patch (flatter tyre with respect to the track) the more grip *that* tyre can generate.
Still a vague answer, I know, sorry
Get the hudy set up book - it goes into heaps of detail. Also says when things should be changed.
The challenge is to get good enough to know something is occurring and when to change it!