So, I woke up one minecraft morning. Opened my door, went to my outdoor woodcutting chest then boooooooooom. Creeper. It would be epic if we had some form of block, like the light detector block mod, the detected enemies or players in the area and would send a signal for redstone. It would be useful, for example, to call a minecart when a player enters a station. What do you think? Maybe have a range of 5 blocks.
Monster/player detecting block