Any feature that has the ability to move variables up or down in a small space/field is difficult to use. It's tricky to move the variables up or down, the action is often too fast, and the fields too small. If a new variable is added, it's generally added to the bottom, or hard to position it where you may need it. For example, I want all the Q10 variables to appear together, but adding a new Q10 variable places it at the bottom of the predictor list in a regression output. Moving it up is really tricky. Is there another way to move variables other than dragging within the window?