Keyboard Block: "Sign +x -y -z" of activatable block.

[NeonSturm]

Just enter into a Display-Block-like Keyboard-Block:

[keyboard]
  1   -1 +2 +1
  2    0  +2 +1
  3   +1 +2 +1
  4   -1 +1 +1
  5    0  +1 +1
  6   +1 +1 +1
  7   -1  0  +1
  8    0  0 +1
  9   +1 0 +1
  Enter   -1 -1 +1
  Cancel   +1 -1 +1
[show]
  Buttons:
    1 | 2 | 3
    4 | 5 | 6
    7 | 8 | 9
    Enter, Cancel
  Valid Input : [block 0 -1 +1]

After activation, it grabs your keyboard input and activates logic blocks (or later mod scripts).
(de-activate interaction with ESC or Moues?)