Dear all,
I know I should be sending this to the dev list, but I'm not a member and I'm feeling lazy.
In Illustrator there's a tool to import data in a spreadsheet, and create basic charts from that. It's very handy for people who do data-visualization.
I would think that Inkscape is just as good as Illustrator for tweaking existing svg charts (colors, text, layout, etc.). But due to the lack of this tool Inkscape currently requires an extra step to create the charts with another application (e.g. the R project for statistical computing).
I looked at tutorials to create extensions. I think that the logic could be quite easily implemented (i.e. calculating scales, displaying the shapes). But there doesn't seem to be a spreadsheet widget for the UI, which makes it a no-go if users can't input a few simple numbers manually.