More detailed trading?

Would be great if trading was split into the regular, "slow" barter where you load up the goods and take them to the destination with no unity use, and "instant" unity-using cry for help, where a neighboring settlement just sends you the goods on their own ship (which still needs to travel to your island and dock on a trading platform, which is kind of useless at the moment).
This would make other islands appear more "real", with potential relationships forming, and maybe say them also asking for your help later down the line, or asking to protect them from pirates by sending in your ship, or even helping you fend off a pirate invasion that wants to steal all your food and women?
Rather than being an abstract NPC shop we've seen a million times.