This idea has been merged into another idea. To comment or vote on this idea, please visit A-I-9829 Allow configuration of dashboards to tie panels directly to reports.
I can understand the rational of keeping formatting options between a source roadmap or pivot chart different. However there is also a good argument to want to always keep the dashboard and the source report in synch. Right now, many of our users are having to duplicate effot when making minor changes to colours etc .