Sorry, I didn't make that very clear did I? I meant to imply a format string per default summary line type. So the table format could easily be altered with column orders specified in a list of column names for example. This works pretty well if the column information happens to be stored in a hash, but it it pretty trivial to use a hash to map from a list of names to an index in any case.

Report information that by default was suppressed would still be suppressed, but a specific format string could be supplied if required.