Well, long story short, you could use an expression like this:

Select all of your rigid objects in the viewport, then in the channelbox, highlight the x,y and z initialSpin attributes, right-click and choose expressions, and paste this into the box:

RigidObjectName|SolverName.initialSpinX = rand(1,2);
RigidObjectName|SolverName.initialSpinY = rand(1,2);
RigidObjectName|SolverName.initialSpinZ = rand(1,2);

Worked for me.....