As time moves on and the world of VAT, VIES, Intrastat etc... gets more complex, it would be a massive help to users and support teams to be able to display the Customer or Suppliers' Default Tax Code (along with their 'Use Default Tax code' option selection) and Country Code on the Customer and Supplier List Screens. The user would be able to see at a glance if they have tax code / correct tax codes applied as per the customer or suppliers country. Very handy if you have a long customer or supplier list. There are many fields that you can display as a column, which are of not much relevance (imo), and are just taking up space in the list (right click list).
Likewise for the Product List Screen: Country of Origin Code, Tax Code and Purchase Nominal code fields would be very useful to have listed in columns. Very handy if you have a long product list and want to quickly browse down through it to find any tax code or nominal code assignation anomalies. You can already display the Product Sales nominal code, but not the Product purchase nominal code.
It would be very functional to have these, to select & display as columns.