#define START_STEP_WITH_HIGH 0

#define EXTRUDERS 1

#define EXT0_WAIT_RETRACT_TEMP 150

#define DECOUPLING_TEST_MAX_HOLD_VARIANCE 20

2) Look for #define HOMING_FEEDRATE {50*60, 50*60, 4*60, 0} under Movement Settings

#define XAXIS_STEPS_PER_MM 80

 #define SDSS               31 // 31 http://reprap.org/wiki/Melzi#Melzi_Arduino_Pin_Numbers says 31, schamtic show pin 37 = PA0 which is arduino pin 31!

At the top of ui.h I have notice the new option of :#define DISPLAY_GAMEDUINO2 6 

#define ENDSTOP_X_BACK_ON_HOME 1

#define BAUDRATE 250000

This solved the issue described directly above...#define ENDSTOP_Z_BACK_ON_HOME 10

#define Z_PROBE_Z_OFFSET 0

#define MICROSTEP_MODES {16,16,16,16,16} // [1,2,4,8,16]

#define DOUBLE_STEP_DELAY  in a Range from 0 to 10 , (Optimum seems around 3 )

#define BENDING_CORRECTION_A 0

One thing you should be aware of is setting #define ENDSTOP_Z_BACK_ON_HOME 10 or higher. Only that way you do not touch too fast the endstops since deltas have after homing 0mm play to the sides and m

For delta only z is relevant, so  #define ENDSTOP_Z_BACK_MOVE 3

#define MIN_DEFECT_TEMPERATURE -10

#define FEATURE_Z_PROBE 1

 #define SDSUPPORT 1