for those interesed, I have implemented a multi display system for JME2. Basically I've removed a (huge) number of static references to DisplaySystem.getDisplaySystem(). Now the Renderer has a reference to the DisplaySystem where it was created.
The implementation took about 4hrs. Nothing difficult. I wonder why JME2 does not have this feature by default.
Now the implementation is working on the LWJGL path. Import/export is working correctly.
Some very little api changes are needed to adapt/run the JME samples.
I'd say post the diff in the Contribution Depot and lets discuss and maybe commit it to jme trunk.
ok, let me cleanup the code and I'll do it.