U'd be a little suspicious of that 620 passengers for ocean going - the article I read on her stated that her normal voyage only lasted 4 hours - and what is acceptable for 4 hours most definately isn't for an Atlantic crossing [I think the "Staterooms" would only hold a very small percentage of the passengers, by the way]...
BUT, that doesn't mean she wouldn't be extremely useful, and wouldn't have a good capacity - she is a fair sized vessel, and, as you say, configured for vehicular cargo too.
I think there may well be a number of attempts to convert oil fired vessels into coal burners, although most of them would probably not be terribly successful.
One interesting side effect is that ships would become visible from a much greater range due to the plume of smoke they would emit. Think first world war ships, or, even better, pre dreadnoughts.
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