mighty crescent
This should be player choice, not bot choice, since there is no mathematically superior option. Sometimes, I want to guarantee a single hit, but other times, I'd rather increase my chances of multiple hits, even at the cost of less consistency. For example, maybe I want to add the +5 to hit to my dreadnaught to guarantee a kill, even if +1 of that bonus is wasted, but other times, I might want to maximize the total number of hits and to choose to add it to my fighter instead.
Additionally, the odds of all misses also change depending upon which ship is chosen, and in my current game the bot chose the ship that resulted in the highest odds of failure. In this game, I attacked a cruiser with 2 dreadnaughts and 1 destroyer, and the bot decided that the destroyer should have the +2 role. The odds of all of my ships missing with the bot's decision would be .60 X .40 X .40 = .096, or 9.6%. However, if I was allowed to add that bonus to my dreadnaught instead, the odds of all of my ships missing would have been .80 X .40 X .20 = .064, or 6.4%. It's unclear to me why the bot decided to add it to the single destroyer when there was a clearly superior option available that would have made it more likely for me to kill the enemy cruiser.
celest harbor