In-fact it is exactly what I do. But the thing is the rules basically state "Halt" or "Stop" doesn't cut it as a demand. Where in everyone elses eyes its a perfectly valid one. Also the RP factors in here, and what RP stands for.
And the "Waiting to scan someone before you could ask them to stop" rule you stated, would not be very logical as per the games structure and the way its played. Besides, how would you police it.
The whole thing here is, the traders have all the rules in favor of them. They even get a waver with the whole PVP rule, stated previously in this post. Which I also find stupid. Now, if we can't stop the trader by cutting his run by killing him, or by telling him to stop verbally, we don't have many options. Often by the time we make our demand, by writing it in RP (Which often takes a long time...) they have made their escape. Players resort to "2 mill or die" And I have heard from many people..."That is ooRP, I refuse to pay unless its written in RP.
So by allowing us the right to "Halt" as a valid demand, the trader will have more incentive to pay, as they know their fate depends on whether they cruise or sit still...
Pirates have a purpose too. We ain't just a happy bunch of PvP whores.
EDIT: Sorry about the double post. I hit the wrong button:(
I do understand the desire for wanting to give traders more incentive to want to pay.
But I also understand this, life as a pirate is supposed to be difficult not easy.
Also keep into consideration that any such rule should be applied equally on both sides.
If pirates are permitted to destroy a trader because his demand to halt was not obeyed.
Then lawfuls should be able to destroy a smuggler after either verifying that he is carrying contriband OR if he has a history of being a smuggler and does not halt if ordered regardless of what he is currently carrying.
Be careful what you wish for, you may have it used against you.