Actually goober's complaint was my only one as well, it would be cool if the ship didn't disappear when you can see it going in, but did when viewed from behind the effect. I'd hope to see that fixed somehow.
I think that's the first time I've been mixed up with Goober...
I was thinking that it would be possible if you took advantage of RTT to render the ship once in the mission, and then again on the texture of the warp effect. The problems would be, first of all, you'd have to render a starfield, then the ship, and then clip the render using the effect (ie replace the alpha channel of the RTT texture with the effect texture). Second of all, I don't understand the math well enough to know right off how to make it look as if you were looking through the node, rather than at a flat texture. I think you'd have to move the 'camera' rendering the ship onto the texture.
But if you were able to do all that, especially the latter, you would have a very good starting point for doing Portals like in Portal or Prey. I'd say that it's worth undertaking, but I'm not taking it on right now.