Middle Lightkey button not working

[r043v]

middle key is a clone of the shift key, to change it you need patch the keypad firmware

Binding LK3 to Pause Game in Retroarch. Is it possible?

Is it possible to bind the useless LightKey middle button to Pause Game in retroarch? I tried binding it in Retroarch directly but it seems that I can’t bind anything in there, this must be another GREAT effect of this OS v.04… So, in retroarch.cfg, how can I achieve that exactly. Thanks