I think the answer is No, but, can this 3 column frame consist of seperate widths?
This document is always in a state of revision - you wouldn't believe how often your cable/satelite company is updating.
Prior to Span Columns, this required many tedious frame adjustments, now I am able to to use a single frame, single story, with Heads Span (including Rules )
I've been directed not to allow soft returns, full lines only, for the Digital Device Required instances. I don't like the apearance, but will live with it if necessary.
A multi-column frame cannot have different column widths.
A Google search for "InDesign multiple column text frames" without quotes caught a lot of links, including this: