Compression, rebound & pre-load for rear, and I think rebound for front (?). Front & rear were built to specs for my needs, ie, at the light end.. 1-up commuting, at the hard end, 2-up with baggage and towing. We estimated about maybe 230-250kg all-up at the heavy end, plus towing.
Only had them installed a few weeks, I've already backed off the oil-adjuster (rear shocks) for the initial compression damping from where it was set (a bit harsh on bumps), then brought it up slowly till it felt good. And that's with the pre-load adjuster all the way out. For 2-up I should be able to just use the pre-load adjuster to compensate for extra weight.
As for the fronts, haven't played with them yet, but they feel pretty good compared to the OEM shocks. Maybe when I learn a bit more about the "feel" I'll start playing with front too. Easily done.