There are already some redstone mechanisms which are possible to create. I have some redstone because before the Exploration Update, it was a potion ingredient (Ptolemy). I still have 2 or 3 stacks and I combined them with 2 fence gates, some redstone torches, a lever and a pressure plate to a double-locked-hidden-painting-entrance. You have to pull the lever and put something on the pressure plate to be able to go through the painting. It's absolutely not laggy, but it's only a small redstone meachnism in my basement.