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Here's your modified version as a patch against svn HEAD.
(Most of the patch is indentation changes. "svn diff
--diff-cmd diff -x -b Lib/pprint.py" gives this diff:

134d133
<         if sepLines:
154a154
>                         if sepLines:
155a156,157
>                         else:
>                             write(', %s: ' % rep)
180a183
>                         if sepLines:
181a185,186
>                         else:
>                             write(', ')
190d194
< 
192a197
>

The patch looks good, but it still has a problem that the
original pprint has: For each call to format() the object is
formatted twice, once to determine if it fits on one line
and once for the final output.