What happens if you submit orders for another player?
I believe the traditional response is to feed the game board to a tiger and award the offending player a toothbrush covered in jam. 

Which is to say, you're asking what the rules say should happen in a scenario that cannot happen if you're following the rules. That implies a contradiction, and contradiction implies anything.

The rules of the game say "...each player writes an order for each of his/her units on a piece of paper." (emphasis added). If you choose not to play the game that way, you're pretty much going to be on your own when it comes to deciding what the implications of your alternative rules are.