Hard to make a call since I have VERY mixed feelings regarding this idea.
While on the paper it looks nice and will prevent abuse from pirates by making the trip costly to a point it's not worthy the hassle - what if the trader, for example, has a load of Gold Ore? That thing can be sold for 10k a piece in Pittsburgh, a 5ker full of it can easily have a cargo worthy of -50 million-. That seems quite out of place for me.
There is also the fact that some people will just abuse it for the hecks of it. Why? because they can. You have to remember that "rule" 0.0 is just a myth and plenty of the people who play the game would rather abuse whatever they can to a maximum level since that's how they find their fun.
I like the idea, but with the way lots of people in this community behave I really don't believe it's feasible.
ACTUALLY, I have a new idea. Why not have an allowed move locations for each area, rather than any base?