Filter the SalesForceField Key Drop-Down with only the relevant fields for the SalesForce object selected for the form

Currently the drop-down contains all available fields from Lead, Contact, and Account.

The following will filter the list to only the fields for the selected SalesForce Object Type for the webform being created:
form salesforce object type code is defined as 'l'-Lead, 'c'-Contact,'a'-Account,'p'-'Person Account','m'-'Account + Contact'
salesforcewebform_fields.inc -- pass object type code into salesforcewebform_available_fields

// available fields in SalesForce
// NEW CODE -- Add parameter $form_sfobject_typecode
function salesforcewebform_available_fields($form_sfobject_typecode) {
   $fields = array(    
    //Special Field to block Processing
    0 => '--Do Not Map to SalesForce--',
    );

  //Define Implementation for hook_salesforcewebform_fields
// NEW CODE -- pass parameter to salesforcewebform_fields
  $fields = array_merge($fields, module_invoke_all('salesforcewebform_fields', $form_sfobject_typecode));

  return $fields;
}

salesforcefields.module -- only return fields that belong to the object type code

// NEW CODE -- Accept new parameter $form_sf_object_typecode
function salesforcefields_salesforcewebform_fields($form_sf_object_typecode)
{
// BEGIN NEW CODE -- Translate sf object type code, to SF object names
  switch($form_sf_object_typecode) {
    case "l":
      $types = array('Lead');
    break;
    case "c":
      $types = array('Contact');
    break;
    case "p":
      $types = array('Account');
    break;
    case "a":
      $types = array('Account');
    break;
    case "m":
      $types = array('Contact','Account');
    break;
  }
  // END NEW CODE
   $real_fields = salesforce_api_describeSObjects(array('Lead', 'Contact', 'Account'));
  if ($real_fields) {
    foreach($real_fields as $objtype) {
// NEW CODE -- Add a check to see if the current SF object is one of the ones this form uses
// NEW CODE -- If it is then add the fields to the list
	  if(in_array($objtype=>name, $types)) {
		  foreach ($objtype->fields AS $key => $field) {
			if ($field->name && $field->label) {
			  $fields[$field->name] = $field->label;
			}
		  }
	  } // NEW CODE END
    } 
  }
  return $fields;
}

salesforcewebform.module -- add object type code to all salesforcewebform_available_fields calls (there are 2, one when editing webform components and one when processing the form submit)

...
/**
 * Allow for editing webforms with SalesForce connection information and modifying the
 * each webform to post to SalesForce.
 */
function salesforcewebform_form_alter(&$form, &$form_state, $form_id) {
...
	// handle editing fields on the webform
	elseif ( $form_id == 'webform_component_edit_form' ) {
 		// if the user has specified the SalesForce action, then we will be posting the form to SalesForce
		if ( $form['#parameters'][2]->use_salesforce == 1 ) {
	    module_load_include('inc', 'salesforcewebform', 'salesforcewebform_fields');
// NEW CODE -- get the object type code 
$object_typecode = ($node->salesforce_object) ? $node->salesforce_object : "l";
// NEW CODE -- add it to the salesforcewebform_available_fields call
		  foreach(salesforcewebform_available_fields($object_typecode) as $sfwafkey=>$sfwafvalue) {
        if (!is_array($sfwafvalue)) {
          $sfwafkey = strtolower($sfwafkey);
          $sfwaf_array[$sfwafkey] = $sfwafvalue;
        }
...
}
...
function salesforcewebform_process($node, $form, $form_state) {
  $object_typecode = ($node->salesforce_object) ? $node->salesforce_object : "l";
...
	$all_fields = array();
// NEW CODE -- Add object typecode to the salesforcewebform_available_fields call        
	$master_fields = array_merge(salesforcewebform_available_fields($object_typecode), salesforcewebform_load_custom_fields(NULL));
	$submission = array();
...
}
...

I apologize if I am not submitting purposed changes correctly, but I am trying to post them here in case someone can use them, while I am making them to my copy. I also apologize for any typos, I am working off a remote box.

Thanks