@nmatheis: Both the x5 and the e12 are held in pretty damn tight in the case. They really don't move at all. I haven't placed any material between them, apart from the mesh that holds them in place and have been using the case for the last few days. No scratches so far.
You could just lay a small piece of cloth over the face of the x5. This would certainly stop any possible scratching. I will do that myself for tomorrow; should have done it earlier, just a busy week and haven't stopped.
The mesh that holds them in place is very tight. I was a little concerned that it could be constantly pressing the wheel button on the x5. But after a close examination, it seems the wheel rim on the silicon case should prevent that happening.
Hope this helps