You can control the spacing between stamps in a stroke so they are close or far apart, or so their spacing has an element of randomness.
In the Brush Options window, do the following:
You can make stamps rotate in the direction of a stroke or always remain in the same direction, or rotate with an element of randomness.
In the Brush Options window, do the following in the Brush Stroke section:
To rotate the brush stamp in the direction of the brush stroke, turn on Rotate to Stroke.
To always keep the brush stamp in the same direction and not rotate it in the direction of the brush stroke, turn off Rotate to Stroke.
Set Rotation Jitter to control the amount of random variation in the brush stamp direction. The valid range is 0 (no random variation) to 180 (high random variation).