Was just thinking of how difficult it would be to not kill yourself with a "Momentum Control" type superpower. Would you accept this power if it meant you needed to learn it ASAP in order to use it in live mission scenarios? (involving some combat, exploration and/or search and rescue)
Note, the attached image is only one of the ways in which this power can be used. An instant momentum cancel would be a pretty basic maneuver for anyone with "Absolute Momentum Control" and it would also be one of the more dangerous tricks since failing to completely cancel your momentum could result in your brain getting crushed against your skull by its own momentum.
(I should also like to point out that the person on the right side is supposed to be an example of what happens when you cancel the momentum on your skin, skeleton and other external or near-external parts of your body but you fail to cancel momentum on your internal organs. Looking at it again, I can see it's a bit hard to tell what that image was supposed to represent.)
This power can of course be used to move yourself in any direction as well. And if you think of anything else that should theoretically be possible with "Absolute" control over momentum, then we can consider that a part of the power as well (within reason).