I noticed in a recent game that you can place a rally point anywhere you have ever explored. After the rally point is set, you can send any ship there regardless of range. A short range ship will move right past it's range limit to the rally point. The implication is that once you establish a colony or star base you can send any range ship there if you place a rally point. You could design a high speed war ship with no life support and send it where ever your long range ships have gone. You must have a ZOC established by a colony or starbase at the destination or the ship become useless and only able to return home.
Probably not the most useful exploit but nevertheless interesting.