It is convenient to see how they change the appearance when editing, so a vertically oriented text should remain vertical when editing, as implemented, for example, in Microsoft Office 2003.
Cannot support. What I see in Office 2003 and Office 2010 is that they behave similar to LO. Please attach a mockup or screenshot.
It is really so. I messed up with editing tables in MS Word.
If I understand well, you agreed that't not a bug.