You know when you're editing wings and it says "wing symmetry", right? Well, maybe "semi-symmetric" would be the real shape of a wing, "symmetric" would be rounded on both front and back, and "flat bottom" would be the current wing shape. Let me know if this should be added in the next update.
@Zoomzoom999 No. This feature refers to the airfoil. What you are suggesting refers to the planform. Two completely diffent aspects of wing design.
Flat bottom wings are wings with flat bottom and rounded top side, creating lots of lift and drag. Semi symmetric have slightly rounded bottom, reducing both drag and lift. Symmetric have both sides slightly rounded, for minimal drag.
@AndrewGarrison