Rebinding L2+R2

[N3Cr0]

Today, I added the L2 and R2 button to my Pandora. They are bound to "+" (keycode 86) and "-" (keycode 82).

 xev gives me exactly the same output like pressing [Fn]+[F] or [Fn]+[D]. That means rebinding them in xmodmap would also change the original "+" and "-" buttons.

Is there a way to bind those shoulder buttons separately? I'd like to use them as scroll wheel (mouse4+5) or AltGr and Compose.

 

[Askarus]

I don't know how.

I use them as + and - as it's fine for Gaming.

Also for controlling Deadbeef when Lid is closed.