Out of interest, here are the default TinyMCE init values in my current install of WordPress 3.0 (not certain if any are set via options page)
array(
['mode'] =>
'specific_textareas'
...
['editor_selector'] =>
'theEditor'
...
['width'] =>
'100%'
...
['theme'] =>
'advanced'
...
['skin'] =>
'wp_theme'
...
['theme_advanced_buttons1'] =>
'bold,italic,strikethrough,|,bullist,numlist,blockquote,|,justifyleft,justifycenter,justifyright,|,link,unlink,wp_more,|,spellchecker,fullscreen,wp_adv'
...
['theme_advanced_buttons2'] =>
'formatselect,underline,justifyfull,forecolor,|,pastetext,pasteword,removeformat,|,media,charmap,|,outdent,indent,|,undo,redo,wp_help'
...
['theme_advanced_buttons3'] =>
...
['theme_advanced_buttons4'] =>
...
['language'] =>
'en'
...
['spellchecker_languages'] =>
'+English=en,Danish=da,Dutch=nl,Finnish=fi,French=fr,German=de,Italian=it,Polish=pl,Portuguese=pt,Spanish=es,Swedish=sv'
...
['theme_advanced_toolbar_location'] =>
'top'
...
['theme_advanced_toolbar_align'] =>
'left'
...
['theme_advanced_statusbar_location'] =>
'bottom'
...
['theme_advanced_resizing'] =>
TRUE
...
['theme_advanced_resize_horizontal'] =>
FALSE
...
['dialog_type'] =>
'modal'
...
['relative_urls'] =>
FALSE
...
['remove_script_host'] =>
FALSE
...
['convert_urls'] =>
FALSE
...
['apply_source_formatting'] =>
FALSE
...
['remove_linebreaks'] =>
TRUE
...
['gecko_spellcheck'] =>
TRUE
...
['entities'] =>
'38,amp,60,lt,62,gt'
...
['accessibility_focus'] =>
TRUE
...
['tabfocus_elements'] =>
'major-publishing-actions'
...
['media_strict'] =>
FALSE
...
['paste_remove_styles'] =>
TRUE
...
['paste_remove_spans'] =>
TRUE
...
['paste_strip_class_attributes'] =>
'all'
...
['wpeditimage_disable_captions'] =>
FALSE
...
['plugins'] =>
'safari,inlinepopups,spellchecker,paste,wordpress,media,fullscreen,wpeditimage,wpgallery,tabfocus'
...
['content_css'] =>
'https://www.example.com/wp-content/themes/example/editor-style.css'
...
)
You should be able to override any of them (at your own risk!!!) via zotsf’s function above.