Keyboard layout: Axis-49 Axis-64 Terpstra ...

... scale size (n steps will be labeled from 0 to n-1, colored randomly for now)
... shift scale steps (...)
... number of steps in +x direction (+x = to the right and up)
... number of steps in +y direction (+y = straight up (Axis) / up and slightly to the right (Terpstra))
... image size factor (= distance in pixels from the center of one key to the next)