Comment 3 for bug 926191

That tool parameter settings are shared between multiple documents is not a problem. Problem is that new document's starting value for input widget is constant. That bug affects not only calligraphy tool, but many other tools. So I try to change as many as I see constant values for widgets to something like this (example for calligraphy):

Inkscape::Preferences::get()->getDouble("/tools/calligraphic/width",15.)