1) In addition to building your MR account structure on simply your Dynamics GP Chart of Accounts and your Analytical Accounting dimensions (which you could do with FRx), you can also include the Account Category or any of the GL Account Maintenance user defined fields.
2) The flexibility of the Financial Dimensions leaves FRx's structured rules behind and simplifies the report design process. An example is that you can code a particlar line in a row format to include a single segment from your Chart of Accounts, while another line in the same row may actually reference multiple segments.