I'd call it a regional express train, albeit a very good one, more because of its sub-125mph top speed and length than door positions, though those also contribute. It could be used on all sorts of stuff in double formation, but it isn't really ideal for them. Single ones for Manchester to Scotland were an utter joke with nowhere near enough capacity.
It might have more seats (and in a better layout) than a 4-car Voyager, but all that highlights is that a 4-car Voyager is a very, very poorly designed train with huge amounts of wasted space.
The EMR route, if you mean Liv-Notts, is not a classic InterCity route, it's a string of regional expresses attached together for operational and passenger convenience. Yes, they'd be ideal for it, but that's because it is a regional express!