In a setting I've been working with, I sought a method of sublight travel that wasn't crazy engines or magic. I've already got FTL using a different method than the Alcubierre drive, so it wouldn't be used for this purpose. Furthermore, I postulate that the power requirements for such usage aren't attainable.
What, if anything, changes when the Alcubierre is only used at around 10% the speed of light? Does this change at other percentages?
I envisitioned the Alcubierre drive in this manner acting as a "Cruise mode" for travel within star systems. Plot your course, hit the drive and let autopilot take care of the rest.
Your sensors can detect other objects in the system and you can broadcast your path so collisions can be avoided. Furthermore, emergency safeties will drop the drive before any collision would occur.
Furthermore I assume that when you cease using the drive, the craft that was using it is no has a forward velocity. Clarification on this, if any would be helpful.