@megadeath Hi, As Quasi wrote, you can control as he stated. It’s easy , with the now-standard Launcher to change to key commands to your desired Z and X . If you set PROG 1( if only because BMS spawns in PROG 1) for 3 chaff , PROG 6 for 3 flares, and do a “mix” PROG 5, you’d have z,x,and s right there.
Another option is Voice Attack or similar program. I used to not have the Slap button on my HOTAS, and made a VA voice command