Why couldn't Lack implement a pop up window that says:
"Drop XXX Armies on XXXX
Are you sure? YES/NO"
Just like if you are deleting an e-mail or program, your computer asks you if you are sure if you want to do it. That way the armies don't have to be dropped, and you are allowed at least a second chance to read where your armies are being dropped...I am only mentioning this because I have lost crucial games where I thought I was dropping in one place and then my armies pop up somewhere far away from the action and i am unable to attack.
My most recent misdrop was because of the computer at work. It has a touchy scroll button on the mouse, and when I clicked to drop, the scroll button scrolled up to the next territory. I was mad for a week over that, because I came back from losing the game early on, and dominated the board!
So I am all for something along the lines of at least giving you a second chance before you commit to a particular drop.
Does this make sense?
I don't know about an undo button, but a second chance pop up window would be alright in my book.
Then again, misdrops are just part of the game, and your enemy might do the same and allow you to win a game because of it.
I would be more in favor of a second chance window than a Undo Button feature...