[Bf-cycles] Lamps Inside SSS Volumes

[Zauber Paracelsus]

I had been working on a character model, and wanted to create the 
appearance of an internal glow in the characters hands when they used 
magic.  I tried doing this with subsurface scattering.  What I first 
tried was adding an emission shader with a mix node that would cause it 
to emit light backwards into the mesh.  Then I tried putting a lamp 
inside of the mesh.  In both cases, nothing happened.

Is this an implementation bug, or a known limitation?  And is it at all 
possible to extend SSS to support this?