I'm not aware of any provision for that other than opening up the holes for the top mount. The trailing arm at the bottom is fixed although I suppose those holes could be slotted as well...???
If you go with the RSS adjustable control arms, you can adjust caster as well as camber. Another option is to modify the existing control arms with new eccentric "pucks". I believe you can buy these from Tarett or RSS, and perhaps Elephant.