[Captain Kwok]

I don't think so. Each entry corresponds to a specific item like an ability or displayed text. The empty entries won't do anything because they are not currently used in the game. There's no way for us to code in a function to treat a new entry or even a current entry in a different way.

The coolness of MainStrings.txt lies in the fact that for a mod like Space Food Empires - I could rename the resources and even the abilities associated with them to what I wanted. For example, I change Minerals to Carbohydrates and so I would change the ability "Mined Resource Generation - Minerals" to something like "Resource Point Generation - Carbohydrates" etc.