[thinksketch]

Yes, but you wouldn't have to use tilt scrolling in those conditions. Tilt-scrolling would be disabled by default. When the conditions were appropriate, you could opt to enable it simply by holding your finger on the screen for two seconds. (Touch scrolling would always be enabled.) Maybe a quick tap on the screen might turn off tilt-scrolling so that if your conditions changed, you could disable it before you lost your place.

If you were in a train that was accelerating, you could choose not to use the feature, or you could just use it while the ride was smooth and quickly switch to touch-only mode when necessary. For slight accelerations, you could also adjust for your environment's movement intuitively much like you naturally tilt a cup of coffee slightly as you move.