Benefits (How this will benefit the server and game as a whole):
Faster, "better" and more accurate information flow of the battlefield to everyone. Since most won't stop to inform the rest what's going on mid fight.
Details (Description of how you think this would work, the benefits, etc):
Players could setup their own macro messages that they can use during combat without the risk of getting killed while typing. This would also give a better/more accurate picture of the current situation to command/queen.
Implementation (Optional, if you have an idea how to implement it):
Since there are already named areas in the map that can be accessed. (In death messages.) I believe those can be used. Ideally it would be something that works inside a Say"" command to make the macros clean. But it doesn't have to since something like: 'Say"We are being over run!"/n%current-location' would work too and would just print location on a new line. (as I imagine it

There is one thing to consider though and that is to make sure how it can be used by marines while being taken to a nest, or while nested.