Customizing "More Metrics"

When I click “Display a table with more metrics” on a report like Operating System, one of the columns shown is Conversion Rate, which appears to be the conversion percentage for all goals. Can I list an additional column in a report, or make this column the conversion rate for a specific goal ID rather than all goals?

It is not possible to view the conversion rates of Operating system, per goal.

Right now the available conversion rates per goal are for the following dimensions

View goals by Referrers

Referrer Type
Keywords
Search Engines
Websites
Campaigns

View goals by Visit

Country
Continent
Region
City
Visits to Conversion
Days to Conversion
Custom Variables

View goals by Server time

Server time