I have been setting bibliographies using the following instructions:

\definehead[BibTitle][subject]
\setupsectionblock[BibTitle][number=no,page=right]
\setuphead[BibTitle][style={sc},after={\blank}]

\def\hangover{\hangafter=1\hangindent=1.5pc\raggedright}
\definestartstop[bibliography][
   before={
     \page[no]
     \indenting[never]
     \startalignment[left]
     \BibTitle{bibliography}
     \stopalignment
     \bgroup\appendtoks\hangover\to\everypar
     },
   after={
     \egroup
     \indenting[yes]}]

Is there a way to control the degree of the raggedness of the right  
margin---other than by inserting hyphens manually when feasible? I  
need lines that are somewhat closer to justified than I am currently  
getting.

Alan