I would like to suggest the addition of an extra tick box column in the product selection popup window that would allow users to select all products in each product row, in the same way that selecting the country tick box select all products for that country.
This would save users a lot of time, and RSI (Repetitive Strain Injury) should they wish to submit just 1 product in all countries.
Kind of odd that it doesn't exist already.
Please see the mockup image I created to illustrate the suggestion below.
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