symbol plug-in?

["John J. Cruz" <casacruz bellatlantic net>]

I'm new to Dia and this mailing list.  Please excuse me if these
questions have already been asked.
(1) Is there a menu option I can "click" on to set the drawing screen to
equal the same size that gets printed?
(2) The Electric menu of symbols is not large enough,  there are no
single pole-double throw switches, etc.  Is there a plug-in that I can
download?