I used the txesmi's omnidirectional sample once for multiple light source, long time ago.
But this method not good for performance. So I kept the clip_far of shadow views low. in fact sometimes i even turned off the views and used cubemap as static shadows. My goal was to get rid of stencil shadow bugs.

In one way or another afaik you will need six camera for each light source (for pointlights). i don't know if is there any other way.