Name: any block command Idea: when you step on or click a block that is set it runs a command. How to: /ab set (command) - sets command for the block your looking at. Ex: /ab set /spawn Set this on a pressure pad so when they step on it they run the command /spawn Permission nodes: ab.allow - let's players run te command when they step or click on the block.
xxCrazySkullxx VariableTriggers can do this and more. http://dev.bukkit.org/bukkit-plugins/variabletriggers/