I might have a bit of a play on the weekend and see if i can come up with something better.
in terms of plot, anything to tone down the 'Evil twin' theme would be good. we've already had that before with both Data and Riker. I mean, when they first meet Shinzon acts sincerely but after killing off the senate members we know to be wary of him.
Shinzons betrayel of the romulans could have been an interesting idea if they'd gone somewhere with it.