I know this will break backward compatybility, but I think we should unify names of hooks/events. So, what need to be changed:
Old Name New Name
Events: insertgroup group_add updategroup group_update removegroup group_delete insertrow message_add listupdate list_update selectfolder folder_select Hooks: create_user user_create kill_session session_destroy upload_attachment attachment_upload save_attachment attachment_save outgoing_message_headers message_outgoing_headers outgoing_message_body message_outgoing_body address_sources addressbooks_list get_address_book addressbook_get create_contact contact_create save_contact contact_save delete_contact contact_delete manage_folders folders_list save_preferences settings_save user_preferences settings_list list_prefs_sections settings_sections_list list_identities identities_list create_identity identity_create save_identity identity_save