I'm not fond of the idea of giving liners (other than perhaps the Beetle) a faster thrust speed... As far as 'realism' goes it makes no difference, but as far as Discovery goes, large ship =/= fast. Plus, increasing thrust speed wouldn't really matter for the purpose of getting passengers to their destination quicker... Traveling ships use either cruise or trade lanes most of the time. Thrust is pretty much entirely for combat (and sometimes the little trip between two trade lanes).
I'd really like to see liners go back the way they were, and just count them as transports, even if they can use some better equipment. The lower cargo/larger size makes up for those bonuses, and there's still no way that a Liner would be able to beat a decently-flown gunboat (or bomber, probably).
