I've been on ships that have been "Crash stopped" and there's never any mistaking the rattling, shuddering vibration for what it is when it happens, NONE of which was noted or observed on the Titanic,
Joseph Scarrott said - "It seemed as if the ship shook in the same manner as if the engines had been suddenly reversed to full speed astern, just the same sort of vibration, enough to wake anybody up if they were asleep."
Other survivors described a tremble feeling throughout the ship. I have heard that torpedo impacts against battleships are felt throughout the entire ship as the shockwave travels across the superstructure and cause the vessel to jump, but on merchant / passenger ships the impact is more localised and the area of impact absorbs the shockwave owing to their different design structure. I guess it depends on the size and design of each vessel. My cousin served on merchant ships back in the 1960's and he said when his ship lost a propeller blade it caused the whole ship to tremble and the stern to bounce, but when the Olympic lost her blade 3 times the passengers barely noticed it, and only a few were woken up by the sensation. I believe the Titanic's size and design make her unique in the sense that we don't really know how she would have reacted.