The standard financials appear to load work files with column values and don't contain the actual data fields, so your stuck with the numbers they send over.
The best we have been able to do is some cosmetic stuff and remove percentages. Each core report you change will affect all reports that use that core format for all companies.
There are 9 P&L, 3 Balance Sheet, 4 Trend and 2 Cashflow type Crystal reports definitions they use. All run off a header and a detail work file. The detail has 14 numeric colums and the MAS side only populates the columns necessary for the report.