A button to take you to the bottom of the list may be nice, however not all ships that you may want to cancel will make it to the bottom of the list.
You sent a few ships after event materials, one hour destinations. Your warehouse is now full and you want to send one more ship. So you take a ship and temporarily load it with commodities to send to the market, with the intent to cancel the order shortly after sending that one more ship.
Sorry, but the ship you're looking to cancel is not going to be at the bottom. It's going to be somewhere in the middle, meaning you going to have to hunt for it. After all the market is only a 30 minute destination.