@techee yep, that sounds like the sort of thing.
A couple of comments:
1. since `filetypes_extensions.conf` is not versionable better to use a completely different `[Groups]` name, maybe `[Menu]` because in existing files `[Groups]` will not have `group_name_*` and `group_lang_*` in it. 2. how will it interact with users existing `filetype_extensions.conf` that uses the existing group names? 3. I would leave out the `group_` or any other prefix, its in that section and doesn't need it.