Could relative and page width options be added?

[lyndondrake]

I'm using pandoc-csv2table, which generally does a good job of guessing sensible widths. But occasionally it does something strange, and then I'd like to be able to set the widths on the columns. Some of the other csv table plugins have ways of setting widths, by a list of column widths relative to tablewidth=1 (e.g. 0.1, 0.4, 0.4, 0.1), and of setting the width of the table relative to pagewidth=1. Is this a possibility for pandoc-csv2table?