It'd be nice if the caravan process was a bit more automated as well. As it is, it's kind of a pain to have to select the goods to bring to the depot, select the goods to sell, and then spend time sorting through the (mostly) crap for the few decent items, and then repeating the next time. Export agreements could alleviate this; give an order and you trade what you agreed to export for what you agreed to import. But even failing that, sorting items better would be nice. Something like:
Metals (Select all)
-Gold (Select all)
--Gold bar
--Gold bar
--Gold bar
-Steel (Select all)
--Steel bar
--Steel bar
etc., would be nice, as opposed to how you have to look through all sorts of useless extracts to find the milk, or empty barrels and barrels of blood to find the booze, etc.
I'd definitely like to see larger caravans, though. Provided there exists a way to use what it brings you. And bringing more than 10 steel bars when you put them on high priority would be nice as well.
Increasing the time to produce items might help some aspects (after all, you can't churn out multiple sets of armor in a day), but then you run the problem of too much raw materials, unless you also slow down raw material production too. It's an interesting issue regardless.
I do wish fortress wealth meant more, though; switching to currency trading might alleviate some of this. As a fortress grows wealthy by importing actual wealth items (coins, jewels, etc.), it could divvy it out amongst the dwarves in a way similar to how it was done in the economy (when it worked). And then maybe dwarves could buy things on their own from the caravans without asking you, or place orders for the next year. "Urist Gemcloisters is happy. He bought new clothes from the caravan."
In any event, all this goes to show that there's a lot of improvement to that game that can occur in the caravan ark, so I look forward to seeing what Toady implements.