After using a lot of CAD for college, I find myself missing a feature that most CAD programs I've seen share. When you're editing measurements, you can do simple mathematical expressions, like this:
I could see it being useful for things like having a texture fit n times onto a face, where you would fit it to the face and then just add '/n' at the end of the scale fields.
I had the idea when I was making a curved brick wall last night. I used Alt + Right Click to position the texture at the top of the wall, but I had to move them all by 40 pixels to get the seams of the bricks to line up. Since the wall was curved, I couldn't just select them all and do it in one go as they all had different y-positions. It would have been a lot quicker to just select the face and then paste '-40' into the field like this: