I am very concerned about how this would be "gamed" I believe that delay fuses were used to either deny an enemy access to the target area, and so that a second wave attack could be made. (or I'm totally wrong)
I remember a neat trick in AW3 was that if you were being chased to the deck by an enemy you could drop your bomb and it could be timed just right as to destroy the person chasing you.
Now adding timed fuses is silly, either you could do exactly what I just described but easier, or you could drop at spawns, and get "free" kills, or you could carpet an area again for "free kills"
In our game there is no point in delaying when a target is destroyed, it is always better to destroy it at once. Adding a delay fuse would ONLY be used in ways to "game the game" which removes the whole point of adding them.