^ Nah, as RLM said, Shatner is a huge presence who overwhelms everything else. Nimoy and just Nimoy was the perfect continuity for the new film run. And a pocket hologram would have been too Star Wars-y in a movie already packed with such cues.
<tangent>That said, I'll forever be pissed at Nimoy for not agreeing to guest star on even one Boston Legal because he's "retired from acting", then going and doing the rather unremarkable (at least at the time) Fringe. I mean, dude... wtf?!</tangent>
I read the second two Shatnerverse Mirror novels a decade or so ago, and loved 'em... maybe I'll revisit them at some point...