Worlds first - Alien Storm (Arcade) - Easiest - Hroðr%

Player 1 - Right hand.
Player 2 - Left foot.
Player 3 - Right hand.
I did play the game one time all the way through offline to setup a functional button layout. (Before the stream)
I have enabled the autofire plugin that allows you to simulate repeatedly pressing an emulated button by holding down a key or button combination. Because i played Alien Storm on Sega Mega Drive with that feature all my life.
Rapid Fire: When this is ON, you can hold down the Attack button to repeatedly fire shots without stopping in both the First-Person and Running modes.
As far as i can tell the autofire-plugin is not allowed when speedrunning so no WR.