Well, anyway, if anyone does want to cheat their way to a 1cc of a Touhou game (though I don't really understand the point myself either), auto-bombing probably wouldn't be that useful in the first place. Clearing Easy/Normal is mostly about bombing whenever the game gets dense anyway (well, except in a few games such as UFO which are also about collecting lives to spend, and auto-bombing won't help you with that), and as for Extra/Hard/Lunatic you won't get far without putting in the practice whether you have auto-bombs or not.
I suggest using an infinite lives cheat or slowdown or something instead. Either of those would probably be easier to set up than an auto-bombing patch, for any games that don't already have one.