[Swarn]

Код:

#define PRESSED(%0) (((newkeys & (%0)) == (%0)) && ((oldkeys & (%0)) != (%0)))

Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
	if(PRESSED(KEY_LOOK_BEHIND))
	{
	    // execute command
	}
    return 1;
}

Something like this?