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People are used to thinking about the aspect ratio of displays and
used to not thinking at all about that of pixels.  Most of the modes
are simplt 4:3 modes and the text area is the entire window.  The
only oddball here is the Commodore 64 and 128 40-column modes.
Because they have a border around them that's wider on the sides than
the top/bottom, the display aspect ratio is actually narrower than
a normal NTSC screen (6:5).  It seems the PAL version actually has
square pixels, but nobody has asked for a PAL Commodore mode, and I
think that has a different colour palette too so I'm not doing it.

Just to frustrate DigitalMan a bit, the default custom aspect ratio
is now 4:3 (but can be configured).  At present, modifying the custom
mode while *in* the custom modes "works", which no sane person would
want when adjusting the aspect ratio.