This is absolute nonsense. When you select a protrusion in your model, the first thing that happens is you get this little vector (arrow) right where your curser is. If you select this arrow...accidentally or on purpose, it edits or drags the length of your extrusion! Solidworks PLEASE don't make it so easy to screw up my models. If we want to edit something, we will consciously select the feature AND THEN find the edit command if we really want to edit it. Just like it is for every other feature! There are many other reasons to select features other than editing them. Is there a way to eliminate this automatic assumption? See attached.