Quite frankly, I'd prefer to find a solution without using 2 such navigation blocks. IMHO two seemingly similar blocks would confuse novice SensorPanel users as well as would make keyboard based navigation requiring an unnecessary learning curve.
Instead, how about a right-click menu on the pixel selection button where you can easily choose you preferred stride? If you reckon that would work, please provide us a comprehensive list of stride variations to include in the list. Would e.g. 1px, 5px, 10px, 20px, 50px, 100px, 150px, 200px be sufficient?