Hi,
If a value can be exported from the style editor, it should be animatable. To do this, Right click on a node and export the property, attach a numeric node to the new input and then you can animate the value in the Base Objects rollout of the modifier.
Value in the Base Objects and Parameters rollouts are animatable, but values in the Style rollout (like global scale and curve steps) currently are not.
Hope that helps.
Many thanks,
Paul