I think it would make the menu navigation easier. Whenever I want to make a door that extends in a purely imaginary direction, I try to set the real count to zero before I change the imaginary component. You can set keys to 0+0i so this isn't a problem, and locks use the checkboxes so no issue there. But when I try it on the whole door, I wind up with a negative-copied door. Being able to set doors to 0+0i in the side menu, even if you can't actually place them down, just makes more sense to my brain.