The full story is this: Before Viggen was released there was quite many that asked if we could make it an option so that not all rockets where launched at the same time. I believe the practice rockets IRL Viggen has this feature. We implemented it and I tried it, like once, and found that it was neither very effective or fun to use the rockets this way (thats my opinion at least). So this was a popular request before users actually got their hands on the module and could try it out for themselves. I haven't really seen many use it post-release either but I might be wrong. I feel that if adding the option to drop individual bombs is a very wanted feature I might add it in, but I believe it would work even less well than the multi-shot rocket option.