Add Page-Break, Highlight/Background-Color, extra buttons into the third row (row empty by default), extra buttons into the fourth row (row empty by default), modify dropdown menus, other misc mods

mcedemo_plugin.js

(function() {

    tinymce.create('tinymce.plugins.WRAP', {
        init : function(ed, url) {
            /* wrapping button take 1 */
            ed.addButton('demobutton0', {
                title : 'Wrap Selection in green!',
                cmd : 'mceWRAP',
                image : url + '/coffee.png'
            });
                ed.addCommand('mceWRAP', function() {
                    selection = ed.selection.getContent();
                    ed.selection.setContent('<span style="background: green;">' + selection + '</span>');
                });

            /* wrapping button take 2 */
            ed.addButton('demobutton1', {
                text: 'Wrap Selection',
                title: 'Make it orange!',
                icon: false,
                onclick: function() {
                    selection = ed.selection.getContent();
                    ed.selection.setContent('<span style="background: orange;">' + selection + '</span>');
                }
            });

            /* insert text with button */
            ed.addButton('demobutton2', {
                text: 'Insert Text',
                icon: false,
                onclick: function() {
                    // Open window
                    ed.windowManager.open({
                        title: 'Example plugin',
                        body: [
                            {type: 'textbox', name: 'title', label: 'Title'}
                        ],
                        onsubmit: function(e) {
                            // Insert content when the window form is submitted
                            ed.insertContent('Title: ' + e.data.title);
                        }
                    });
                }
            });

            /* insert text with list box */
            ed.addButton('demobutton3', {
                type: 'listbox', 
                text: 'Insert Text', // dashes to alleviate some padding issues
                fixedWidth: true,
                icon: false,
                values: [
                    {text: 'Menu item 1', value: 'Some text 1'},
                    {text: 'Menu item 2', value: 'Some text 2'},
                    {text: 'Menu item Threeeeeeeeeeee', value: 'Some text 3'}
                ],
                // onPostRender: function() {
                //     // Select the second item by default
                //     this.value('Some text 2');
                // },
                onselect: function(e) {
                    ed.insertContent(this.value());
                }
            });

        }

    });

    // Register plugin
    tinymce.PluginManager.add('DEMO', tinymce.plugins.WRAP);

})();

tinymce-tweaks.php

<?php
//Plugin Name: TinyMCE Toolbar Mods

/**
 * Insert Page-Break button after More button
 */
function add_mce_buttons_row_1( $mce_buttons ) {
	$key = array_search( 'wp_more', $mce_buttons );
	array_splice( $mce_buttons, $key+1, 0, 'wp_page' );
	return $mce_buttons;
}
add_filter('mce_buttons', 'add_mce_buttons_row_1' );

/**
 * Insert Highlight/Background-Color button after Text-Color button
 */
function add_mce_buttons_row_2( $mce_buttons ) {
	// add/remove buttons from $mce_buttons
	$key = array_search( 'forecolor', $mce_buttons );
	array_splice( $mce_buttons, $key+1, 0, 'backcolor' );
	return $mce_buttons;
}
add_filter('mce_buttons_2', 'add_mce_buttons_row_2' );

/**
 * Insert buttons into the third row (row empty by default)
 */
function add_mce_buttons_row_3( $mce_buttons ) {
	$mce_buttons[] = 'styleselect';
	$mce_buttons[] = 'fontselect';
	$mce_buttons[] = 'fontsizeselect';

	return $mce_buttons;
}
add_filter('mce_buttons_3', 'add_mce_buttons_row_3' );

/**
 * Insert buttons into the fourth row (row empty by default)
 */
function add_mce_buttons_row_4( $mce_buttons ) {

	$mce_buttons[] = 'cut';
	$mce_buttons[] = 'copy';
	$mce_buttons[] = 'paste';

	$mce_buttons[] = 'hr';

	$mce_buttons[] = 'subscript';
	$mce_buttons[] = 'superscript';
	$mce_buttons[] = 'media';

	return $mce_buttons;
}
add_filter('mce_buttons_4', 'add_mce_buttons_row_4' );


/**
 * Make changes to the dropdown menus
 * Other misc customizations
 */
function change_mce_dropdown( $initArray ) {

	// limit block formatting options
	$initArray['block_formats'] = 'Paragraph=p;Header 1=h1;Header 2=h2;Header 3=h3';

	// disable caption field in image edit popup
	// $initArray['wpeditimage_disable_captions'] = true;

	// change font options
	$initArray['font_formats'] = trim( 'Andale Mono=andale mono,times;'.
								 'Arial=arial,helvetica,sans-serif;'.
								 // 'Arial Black=arial black,avant garde;'.
								 'Book Antiqua=book antiqua,palatino;'.
								 // 'Comic Sans MS=comic sans ms,sans-serif;'.
								 'Courier New=courier new,courier;'.
								 'Georgia=georgia,palatino;'.
								 'Helvetica=helvetica;'.
								 // 'Impact=impact,chicago;'.
								 // 'Symbol=symbol;'.
								 'Tahoma=tahoma,arial,helvetica,sans-serif;'.
								 'Terminal=terminal,monaco;'.
								 'Times New Roman=times new roman,times;'.
								 'Trebuchet MS=trebuchet ms,geneva;'.
								 'Verdana=verdana,geneva;'.
								 // 'Webdings=webdings;'.
								 'Wingdings=wingdings,zapf dingbats;'.
								 '', ';' );

	// change available font sizes
	$initArray['fontsize_formats'] = '10px 12px 14px 16px 24px';

	// set indentation size
	$initArray['indentation'] = '100px';

	// custom preset formats
	$initArray['style_formats'] = json_encode( array(
        array( 'title' => 'Example 1', 'inline' => 'span', 'classes' => 'example2' ),
		array( 'title' => 'Example 2', 'inline' => 'b' ),
		array( 'title' => 'Example 3', 'block' => 'h1', 'styles' => array( 'color' => '#ff0000' ) ),
	) );

	return $initArray;
}
add_filter('tiny_mce_before_init', 'change_mce_dropdown' );


/**
 * MCE_Plugin_Demo
 *
 */
class MCE_Plugin_Demo {

	var $pluginname = 'DEMO';
	var $internalVersion = 730;

	/**
	 * mcewrapper()
	 * the constructor
	 *
	 * @return void
	 */
	function __construct()  {

		// Modify the version when tinyMCE plugins are changed.
		add_filter('tiny_mce_version', array ( $this, 'change_tinymce_version') );

		// init process for button control
		add_action('admin_init', array ( $this, 'addbuttons') );

	}

	/**
	 * addbuttons()
	 *
	 * @return void
	 */
	function addbuttons() {

		// Don't bother doing this stuff if the current user lacks permissions
		if ( !current_user_can('edit_posts') && !current_user_can('edit_pages') )
			return;

		// Add only in Rich Editor mode
		if ( get_user_option('rich_editing') == 'true' ) {

			// add the button for wp2.5 in a new way
			add_filter('mce_external_plugins', array ( $this, 'add_tinymce_plugin' ) );
			add_filter('mce_buttons',          array ( $this, 'register_button' ), 0 );
		}
	}

	/**
	 * add button to editor
	 *
	 * @param array $buttons
	 * @return array
	 */
	function register_button( $buttons ) {

		array_push( $buttons, 'separator', 'demobutton0', 'demobutton1', 'demobutton2', 'demobutton3' );

		return $buttons;
	}

	/**
	 * Load the TinyMCE plugin : mcedemo_plugin.js
	 *
	 * @param array $plugin_array
	 * @return array
	 */
	function add_tinymce_plugin( $plugin_array ) {

		$plugin_array[ $this->pluginname ] =  plugins_url( 'mcedemo_plugin.js', __FILE__ );

		return $plugin_array;
	}

	/**
	 * A different version will rebuild the cache
	 *
	 * @param int $version
	 * @return int
	 */
	function change_tinymce_version( $version ) {
		$version = $version + $this->internalVersion;
		return $version;
	}

}
$mce_plugin_demo = new MCE_Plugin_Demo();