Is there a schematic showing the pin numbers for the RAMPS 1.4 that correspond to the mega 2560 for arduino programming purposes?

I only know

// For RAMPS 1.4
#define X_STEP_PIN         54
#define X_DIR_PIN          55
#define X_ENABLE_PIN       38
#define X_MIN_PIN           3
#define X_MAX_PIN           2

#define Y_STEP_PIN         60
#define Y_DIR_PIN          61
#define Y_ENABLE_PIN       56
#define Y_MIN_PIN          14
#define Y_MAX_PIN          15

#define Z_STEP_PIN         46
#define Z_DIR_PIN          48
#define Z_ENABLE_PIN       62
#define Z_MIN_PIN          18
#define Z_MAX_PIN          19

#define E_STEP_PIN         26
#define E_DIR_PIN          28
#define E_ENABLE_PIN       24

#define SDPOWER            -1
#define SDSS               53
#define LED_PIN            13

#define FAN_PIN            9

#define PS_ON_PIN          12
#define KILL_PIN           -1

#define HEATER_0_PIN       10
#define HEATER_1_PIN       8
#define TEMP_0_PIN          13   // ANALOG NUMBERING
#define TEMP_1_PIN          14   // ANALOG NUMBERING

But I would like to know all of them so I can use the other pins of the A4988 stepper driver for better motor control. Please let me know!

There is a schematic on the RAMPS wiki page.

The schematic itself is at: [reprap.org]

Note: If you're after the microstepping pins, the RAMPS board does not expose them to programmatic control (ie: you can only set them by jumpers on the board).

Oh... That's exactly what I had wanted to do... how would you set them by jumpers? Is it worth it?

The jumpers should already be there. I have Ramps1.4, and the build instructions had me install all of the jumpers by default. The jumpers are physically beneath their respective Pololu driver. You need to remove the driver to make jumpering changes.