Tools -> Options -> Load/Save -> General -> Always Save As is only for Word/Writer Documents, should also include Calc/Impress/Draw & Base default options too.
it does it indeed. you have 2 drop-down menus: - document type - always save as if you scroll the multiple choices of the document type you'll see that you have an "always save as" option for spreadsheets, presentations, formulas etc. etc RESOLVED NOTABUG
*** This bug has been marked as a duplicate of bug 148756 ***