support for format selection OR formatOnSaveMode

[burakkgunduzz]

I would like to format only the code I specify for some reasons related to the project that I work on.
Therefore, It would be awesome to add support for formating the code only that I select from the editor or when format on save option is enabled, formatOnSaveMode: "modifications" also would prove very useful to me.
Is there any chance to adding one of these?