If you want to remove h2 from your tinymce dropdown, try to delete it from jsparty/tiny_mce2/tiny_mce.js and tiny_mce_src.js or jsparty/tiny_mce2/themes/advanced/editor_template.js and jsparty/tiny_mce2/themes/advanced/editor_template_src.js.
Of course is not good to change core files, but at the moment there is no another way to do it :(