Punish The Lazy
Install by unzipping into your (KSP)/GameData subdirectory.
This plugin will give you a month of in-game time to do something. If you haven't launched a vessel, done some science or come up with anything to do, it starts punishing you at 0.1 reputation per game hour. This means that long time-warp to Jool is going to cost you unless you can take some orbital or Munar contracts on before it gets there!
Update: The mod now pops up messages when you begin to lose reputation.