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Add fonts to editor by edit lang file, example:
class/xoopseditor/tinymce/language/english.php
// FONT LIST, FORMAT: "Name=value1,value2;Name=value"
define("_XOOPS_EDITOR_TINYMCE_FONTS", "Arial=arial,helvetica,sans-serif;Courier New=courier new,courier,monospace;Georgia=georgia,times new roman,times,serif;Tahoma=tahoma,arial,helvetica,sans-serif;Times New Roman=times new roman,times,serif;Verdana=verdana,arial,helvetica,sans-serif;Impact=impact;WingDings=wingdings");