See this AEM topic:
http://docs.adobe.com/content/docs/en/cq/5-6-1/administering/configuring_rich_text_editor.html#Speci... Characters
You can include only those chars that you want in the JCR. The doc states:
Under misctools create a node to hold the special character configurations:
- Name specialCharsConfig
- Type nt:unstructured
Under specialCharsConfig create another node to hold the list of characters:
- Name chars
- Type nt:unstructured
Under chars add a new node to hold an individual character definition.
If you do this and place only those special chars - you should get just special chars and not the other functionality.