R and L almost always denote shoulder buttons. Up, Down, Left and Right denote directional buttons.
On another note, why don't you have a regular WSAD as up down left right and have BAYXLR be on the 124578 on the number pad? far more intuitive.
And yeah, tilde and backspace on ZSNES are the turbo keys, if I recall correctly (I use SNES9X). It's probably a bad idea to map the shoulder buttons to them (not to mention how far ~ and backspace are from each other and how hard they would be to hit during regular gameplay.
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On another note, why don't you have a regular WSAD as up down left right and have BAYXLR be on the 124578 on the number pad? far more intuitive.
And yeah, tilde and backspace on ZSNES are the turbo keys, if I recall correctly (I use SNES9X). It's probably a bad idea to map the shoulder buttons to them (not to mention how far ~ and backspace are from each other and how hard they would be to hit during regular gameplay.