I'm guessing this would have to be a long-term upgrade, but:

A game setting where units destroyed are exactly what one would have predicted if using only the % chance of hitting (rounded up or down, or some other solution). Might make the game harder (especially when dealing with infantry or SAMs or something), but I think it would force us to think differently about the game (in a good way).

That would be a nice option - taking out the ends of the bell curve. So if I can expect 3.5 kills in a battle then I'd have a 50% chance of getting 3 kills and 50% chance of getting 4 kills. No chance of getting extreme results like no kills or 7 kills. I wouldn't want to make this required - just an option.

We will keep it on our long list.
So would it just be a sum of the percentages?

"So would it just be a sum of the percentages?"
That's what I was thinking. Might get weird with SAMs (only 20%) or just having just one infantry defending a land zone - it might force a player to either have more than just one of those units, or some other compromise, like if the total percentage is less than 100 then it reverts to the regular system.

"I wouldn't want to make this required - just an option."
Agreed.