What interesting insights can be gleaned from specific data on imports and exports. There is a ton of open data available on how much of a particular good is imported/exported.  So, let's say I have 20 years of data on how many tomatoes are imported to each country in Scandinavia? Who might care, and what theoretical insights on international trade are supported by such data?
Studies in international trade are already using trade data at a particularly disaggregated level, at the transaction level. 

For instance, this very new paper on Global Firms points out that research in international trade has changed dramatically over the last twenty years, as attention has shifted from countries and industries towards the firms actually engaged in international trade. They outline a framework that allows firms to be of positive measure and to decide simultaneously on the set of production locations, export markets, input sources, products to export, and inputs to import. They use this framework to interpret features of U.S. firm and trade transactions data and highlight interdependencies across these margins of firm international participation.

However, their data is from the U.S. Customs Bureau data and quite confidential. Can you give the source of "ton of open data available on on how much of a particular good is imported/exported"?