Okay, as I build ever bigger and better things, there is something I have repeatedly wished I had. A keypad block. As in a single block that when you hit it brings up a little screen with a standard numerical keypad. Way I envision it working is you slave activators to it, and the number of slaved activators determines how many numbers show up on the interface. You slave 3 activators to it, you get buttons for 1, 2, and 3. You slave 10 to it, you get a full number pad. When you press a button, it would then turn on the corresponding number of activators that are slaved to it. As in if you had a full number pad 0-9 and you pushed 4, it would activate 4 out the 10 slaved activators. Why? Multiple floor elevators get very cumbersome when you need multiple control buttons on any given floor, while having a wall full of buttons to create a password keypad for logic based rail door locks is awesome, but annoying. I could also see it being useful for controlling fighter bays where you punch in which bay you want to launch instead of having an entire room full of buttons.