As a Jet Mobile viewer\user being able to add my own field to a Jet Mobile data grid when viewing a dashboard.  It would be similar to what we do with calculations today in the table builder.  As an example select a column then build s formula such as (column A*column B) this new column would then be called profit.

I would also settle for a designer being able to do this on the fly rather then building it in the JDM.