The little "wheel" tool that allows you to set the angle of the gradient is great. Many graphic design programs use tools similar to this. One thing that they tend to incorporate is that when you hold the shift key down while spinning the setting, it constrains the wheel by 45 degree increments, thus making it very easy to set something to 0°, 45°, 90°, 180° etc...
Just wondering if this would be feasible to add?