Sabertooth motor control - tank styled programming

instead of keychars for steering i was wondering if someone could place working buttons inputs in their place.

#include <SoftwareSerial.h>
#define SABER_TX_PIN 13
#define SABER_RX_PIN 12
#define SABER_BAUDRATE 9600
#define SABER_MOTOR1_FULL_FORWARD 127
#define SABER_MOTOR1_FULL_REVERSE 1
#define SABER_MOTOR1_FULL_STOP 64
#define SABER_MOTOR2_FULL_FORWARD 255
#define SABER_MOTOR2_FULL_REVERSE 128
#define SABER_MOTOR2_FULL_STOP 192
#define SABER_ALL_STOP 0
SoftwareSerial SaberSerial = SoftwareSerial( SABER_RX_PIN, SABER_TX_PIN );
void initSabertooth( void )
{
  pinMode( SABER_TX_PIN, OUTPUT );
  SaberSerial.begin( SABER_BAUDRATE ); 
  delay( 2000 );
  setEngineSpeed( SABER_ALL_STOP );
}
void setEngineSpeed( signed char cNewMotorSpeed )
{
  unsigned char cSpeedVal_Motor1 = 0;
  unsigned char cSpeedVal_Motor2 = 0;
  if( cNewMotorSpeed == 0 )
  {
    SaberSerial.print( 0, BYTE );
    return;
  } 
  if( cNewMotorSpeed >= 100 )
  {
    cSpeedVal_Motor1 = SABER_MOTOR1_FULL_FORWARD;
    cSpeedVal_Motor2 = SABER_MOTOR2_FULL_FORWARD;
  }
  else if( cNewMotorSpeed <= -100 )
  {
    cSpeedVal_Motor1 = SABER_MOTOR1_FULL_REVERSE;
    cSpeedVal_Motor2 = SABER_MOTOR2_FULL_REVERSE;
  }
  else
  {
    cSpeedVal_Motor1 = map( cNewMotorSpeed, 
                           -100, 
                            100, 
                            SABER_MOTOR1_FULL_REVERSE,
                            SABER_MOTOR1_FULL_FORWARD );

     cSpeedVal_Motor2 = map( cNewMotorSpeed, 
                            -100, 
                             100, 
                             SABER_MOTOR2_FULL_REVERSE, 
                             SABER_MOTOR2_FULL_FORWARD );
  }
  SaberSerial.print( cSpeedVal_Motor1, BYTE );
  SaberSerial.print( cSpeedVal_Motor2, BYTE );
}

void setup( )
{
  initSabertooth( );
}
//void control( )
//{
//  // Full stop
//  setEngineSpeed( 0 ); 
//
//  // Half reverse
//  setEngineSpeed( -50 );
//
//  // Full reverse
//  setEngineSpeed( -100 );
//
//  // Half forward
//  setEngineSpeed( 50 );
//
//  // Full forward
//  setEngineSpeed( 100 );
//}

void setEngineSpeedDir( signed char cNewMotorSpeedDir )
{
  unsigned char cSpeedValDir_Motor1 = 0;
  unsigned char cSpeedValDir_Motor2 = 0;
  if( cNewMotorSpeedDir >= 100 )
  {
    cSpeedValDir_Motor1 = SABER_MOTOR1_FULL_FORWARD; // GO RIGHT
    cSpeedValDir_Motor2 = SABER_MOTOR2_FULL_STOP;
  }
  else if( cNewMotorSpeedDir <= -100 )
  {
    cSpeedValDir_Motor1 = SABER_MOTOR1_FULL_STOP; // GO LEFT
    cSpeedValDir_Motor2 = SABER_MOTOR2_FULL_FORWARD;
  }
  else
  {
    cSpeedValDir_Motor1 = map( cNewMotorSpeedDir, 
                              -100, 
                               100, 
                               SABER_MOTOR1_FULL_STOP,
                               SABER_MOTOR1_FULL_FORWARD );
    cSpeedValDir_Motor2 = map( cNewMotorSpeedDir, 
                              -100, 
                               100, 
                               SABER_MOTOR2_FULL_FORWARD, 
                               SABER_MOTOR2_FULL_STOP);
  }
  SaberSerial.print( cSpeedValDir_Motor1, BYTE );
  SaberSerial.print( cSpeedValDir_Motor2, BYTE );
}

//void turn ( )
//{
//  // Turn left 
//  setEngineSpeedDir( -100 );
//
//  // Turn right 
//  setEngineSpeedDir( 100 );
//}




void loop() 
{
  setEngineSpeedDir( -100 );
  delay( 5000 );
  setEngineSpeed( 0 );
 
  
  
  
//  signed char traverse;
//  signed char negotiate;
//
//  if(Serial.available()>0) 
//  {
//    int data = Serial.read();
//
////    digitalWrite(buttonPin,LOW);
//
//    switch(data)
//    {
//      case'w':traverse = 100;break; //full forward
//      case's':traverse = -50;break; // half reverse
//      case'q':traverse = 0;break; // Stop
//      case'a':negotiate = -100;break; // left
//      case'd':negotiate = 100;break; // right
//    }
//
//    setEngineSpeed( traverse );
//    setEngineSpeedDir( negotiate );
//  }
}

Moderator edit: code tags added.

instead of keychars for steering i was wondering if someone could place working buttons inputs in their place.

Yes. If you want to run after the robot and press the switches.

yeah that would be nice

yeah that would be nice

So, what's the problem? You don't know how to read a switch state?