I think I've solved this by changing the template so that it sets the 
height and width of images to fairly large percentages of the page 
*regardless* of their original size. Right now, the template only scales 
up, not down, via these lines:

\def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\
fi}
\def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\
Gin@nat@height\fi}

I've commented these out and put in this line just below them, in place of 
the corresponding original:

\setkeys{Gin}{width=\linewidth,height=0.9\textheight,keepaspectratio}

I also use the Boadilla theme which gives smaller margins, it looks like, 
at least on the left and right.

This seems to work OK with columns, too, though I haven't played around too 
much with it. In-line images require height and width attributes in order 
to work (though that may be true with the original template as well).

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