Spikes + more

Hey Dinnerbone, remember when you suggested spikes in 2012? Well you said that you would like to add them, but you weren't sure how they should've worked. I may have an idea of how they could function: They could be in the redstone tab and, if powered by either a redstone torch or lever, will go from a couple of rocks to actual spikes. They would be crafted with 3 iron in the middle, and 3 stone at the bottom (not stacked) and they can also be used for keeping players/mobs away since they deal 3 hearts of damage if stepped on. Also their hitbox will be like the pressure plate. They will spawn rarely in dungeons and will always spawn in jungle temples. What do you think about that dinnerbone