It would be nice if you could search for either an item(or more importantly a tech) for trade in the diplomacy window.
You enter in a field what you are looking for, and either opens trade with first that matches criteria (most friendly) or it highlights the civilizations which have that tech which you can then open trade with.
Otherwise I have to search through all the planets until I find what I am looking for.
Another option is a list/window of "ALL" available techs for trade, or resources, which I can then double click on and it takes me to the most friendly trade with that item.
