Here is a patch to enable showing anaglyphic stereo (red/blue with
red on the left). 

In szg-1.0/doc/ save the old copy of window_configs.txt if you don't
trust me. Then replace it with the window_configs.txt in this directory.

This will define a new way to make a signle-user window but to enable it
you need to (after sourcing ezszg.sh) do this
:: export SZG_DISPLAY0_name=anaglyph
to return to "normal" do this
:: export SZG_DISPLAY0_name=single_window