Longer LCA's allow you to increase the track with out increasing the scrub radius...bad for steering wheel kick back and sort of bad for handling.
More negative offset wheels, NRCAs both increase the scrub radius. If you use a longer LCA, you can increase the track (more potential grip) and camber the most effective way IMO.
One other side effect is that the front wheel rate (effective spring rate) increases because the spindle is pushed out further as well...the CG has less leverage over the springs during cornering. So you are recommended not to increase more than 10mm.