it will be very useful, and i don't think it will 'make or break' the game. Since those ratios will be (presumably) ratios on pure units, and unless your target is massing only one unit (and thusly deserves to be killed
) you still have to gamble and predict and work through defence/AR etc.
All that being said, I would like the feature to be optional and I'm sure that won't be tricky, there are many options for his extension already, one more won't be the end of the world.
If you're really afraid of losing the 'gambling' aspect of the game, just pick a random ID from your search page, send and log out
That, sir, is gambling!