AS we all know from watching the movies that force lightning techniques are tied to the dark side of the force. so why not alow jedi consulars who go down the dark path to start mastering how to use force lightning in place of the current "i throw this pile of rubble at you!" moves we currently have.
this could also work visa versa for sith inquisitors who decide to go down the light, losing the ability to throw lightning and instead throw rubble!