You don’t seem to know how it works. Let me explain it. It requires two mouse clicks. The steps on how you use it are:
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Press Q-key for Approach and hold the key down.
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Press the left mouse button to set the direction and horizontal distance.
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Press the left mouse button again to set the up- or downward angle.
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Release Q-key and the ship will now approach the position in space.
Basically what it does is to let you enter a 3D vector (a radial vector) to which your ship will approach to in space. You can use it to fly to any free point in space and hold it.