Are we moomin, or are we dancer?
That speed is mass glitch is actually more of a fundamental function of where stuff in our universe comes from. Everything is basically a relation of speed, mass, and time. You can't change one without messing up the other, because those are the fundamental components we are made of. You would have to literally remove parts of yourself to move faster, but then what's the point, since you won't be the one moving any more?
More or less, right. I disagree with this point though, by the time you've accelerated a space craft to 99% light speed, chopping off your arms and flinging them out of the window isn't going to make any tangible difference to your velocity. Most of your mass will be concentrated in the immense space craft, rather than your body.
It would be like giving astronauts a haircut, in order to speed up the space shuttle...technically it would work, but you know...sort of pointless.