Treasure Galleon, realistically speaking, is not going to be implemented. It is too unbalanced and this role as noted in that topic, is undertaken by the Trade Galleon. I am not disapproving it yet, as more ideas might come up, ideas that will be balanced and will worth researching this attempt more.
Mass loading-unloading without selecting a fleet is going to be implemented but currently not on priority list.
The rest, have been implemented.
What could top our current priority list, is the necessity to create the trade in this way that war fleets will be needed too.
Coming Across enemies at sea is one example, but we need something else too.
Something that will stir frictions like in real world. I am talking about those inevitable frictions that are done for profit. This might again fall into the nation control, I do not know already.
This happens already with port control and could happen with guard/escort feature. Let's not forget the options for blockade (port for specific nation or player or guild or hideout blockade later on).
Also, to extend your thoughts on the matter, we have thought perhaps danger-penalizing actions. Right now, a trade gets danger only with ship speed. Perhaps more actions could be thrown into this bucket. In a way this time that trader will do this in-purpose as he will have more profit in this way. To make this happen, we could script one more option for trade routes, an option that will control the pause of trade route after attack (plauer will get to control this).
Please give this a serious thought. We need more action in the game at this front.