you can see the feature on http://inkscape.org/cgi-bin/wiki.pl?PathEstimation

( When will the PathEstimation feature be available in Inkscape? For me, it is the most important feature (for the design of logotypes, arabesques... ) )

Outlining a stroke and insetting/outsetting a path are already in CVS. You can download the CVS and use it, or wait for the next release.

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