If your planning the routes in Mapsource then make a habit of reversing them all before loading onto the unit, you've always got them if you need them or not. Routes are easy to delete off the unit if you find you didn't need them
You would also have thought with the amount of people moaning about it on various forums throught the world they would have added it in a software update even if they hadn't thought to put it on originally. Not excactly a hard thing to do as it's only software.
If your planning the routes in Mapsource then make a habit of reversing them all before loading onto the unit, you've always got them if you need them or not. Routes are easy to delete off the unit if you find you didn't need them