Comment 22 for bug 1365451

not that I know of. This has been discussed a lot in the last year. The issue has not been satisfactorily resolved. I am attaching a few references, there are many more, but these are the ones that come to mind immediately.

https://bugs.launchpad.net/inkscape/+bug/1369197
http://wiki.inkscape.org/wiki/index.php/Units_In_Inkscape:_Document_Unit_Change
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/13748