Rigging Questions

Okay, so I created a basic Ragdoll Rig that works well in blender render, based off of constraints from my skeleton to the rig. Basically, I modled a bunch of UV spheres to coincide with the shapes on my character, then I put empties on them where the bones will be, then I constrained my bones to that rig.

My question is, how do I get that rig working in BGE? And if that’s not possible, how do you do a ragdoll rig in BGE?

Also, another random question, if you wanted to + or - to the scale of a model using a key press, how would you do so?

Thanks for any/all help, sorry a bit nubish questions but can’t really find an answer for them anywhere.