Been a long ol' time since I updated this. I've released a formalized version of my Gunnail alarm hack; it's no different from the version I laid out in a post on shmupsforum, but should be simpler to apply. But that's not all.
I'm also releasing a hack of P-47 Aces, which fixes the sound engine to play sound effects on time. You can get that here: http://daifukkat.su/hacks/p47aces_sfx/. The original behavior is pretty deficient in my opinion, and the fix ended up rather interesting and helping emulation, so I'm glad I went and did it. Though it was amusing to see the end stage screens with constant explosions, I'm hoping having properly timed sound effects will make the game even more enjoyable.
I'm hoping to start posting on this blog again more, some fun stuff coming ahead. For now, happy end of year festivities, whatever they may be. To a pleasant 2020~
Update 2019/12/28: I fixed the P-47 Aces fix, so now it works everywhere.