when you plan a spacecraft trajectory away from earth you have to estimate and budget a small fraction of fuel to compensate for acceleration anomalies that don't have physical explanations
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if you embrace the void and jump off of the space station you'll come right back
Only if I jump perpendicular to the direction of the orbit, no? If I jump retrograde/prograde that should slightly change the period of my orbit and when I intersect the stations orbit again I'd end up behind or in front. That's why those cubesats don't fall back on the ISS.
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3u cubesat are generally given enough velocity from launch to achieve moderate separation, they only weigh 5kg at most so it's relatively easy, 6u cubesats sometimes (but not always) require propulsion to achieve good separation, an adult human is a bit trickier
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