Can ST L3GD20 Gyro's Low pass filter be disabled?
The HPF does look like it should be bypassable. Take a look at the diagram below: -



I've circled the multiplexer in red - this multiplexer chooses whether to use the HPF or not use it. The clue is the phrase HPen (I take this as HP enable): -



The low pass filter (LPF2) can also be bypassed by setting OUT_SEL=01