Mirrored Controls in MotionBuilder

Has anyone made a mirrored control setup in Motionbuilder before so that translating two controls in the X axis at the same time will move the controls in opposing directions? In Maya, you can set the scale to -1 in the axis you want to mirror to achieve this, but Motionbuilder seems to behave differently when moving multiple objects at the same time. It’s almost as if it only cares about the orientation of the last selected object.

Thank you.