Halo 3 Universal Reclaimer scheme

I use the Universal Reclaimer button scheme in all games in the MCC, however in Halo 3 for dual wielding weapons there are separate reload buttons. One being the normal X button and the other being the left thumbstick button. Is there anyway that the left weapon reload could be merged into just the one Reload like in Halo 2? Or can it be added by 343?

What would be cool is if they allowed a custom button layout option, which would allow you to map every specific button to your personal choice, like Fortnite did (even though I hate Fortnite lol)