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It depends on your "new file" policy. Generally I don't like
generating group-writeable files as default, it happened to
me once that I generated a config file which got executed
and it had group write permissions for the whole "user"
group. Not good, at least not what I wanted.
I usually generate a new file with umask 0077 or 0057 and
then if groups must have additional (write) permissions I
call chmod on the new files.

Now, back to roundup: when or for what purpose new files are
generated by the roundup tools I do not know, so I think it
is best if you decide which umask is needed.