It seems like ring finger paddle buttons are becoming a controller staple. I know of these, what are some others?

Clone an existing button only:

• 8BitDo Pro 2 (P1, P2)
• PS4/PS5 controller with remap kit from ExtremeRate (K1, K2, K3, K4)

Treated by Steam as an entirely new button:

• Steam Controller (L4, R4)
• Paired joy-cons (left SL, SR; right SL, SR)
• Steam Deck (L4, L5, R4, R5)
• Xbox Elite (P1, P2, P3, P4)
• Dualsense Edge (LB, RB)

I use a modded PS5 controller on PC. I've found for most purposes, clone-binding R4 to Cross/A and L4 to Square/X is good enough, as that allows me to crouch and jump while also running and turning with the thumbsticks. But it'd be really cool if I could remap these buttons steam-side, instead of needing to clone an existing button controller-side.