Feature Request: Multiple Column Sort in QuoteManager

It would be very helpful to be able to do a multiple column sort in QM.
Currently we can sort on a single column, but then if we sort on a different column the sense of the first sort is not maintained.
For example, I would like to sort all my futures symbols in order, then sort on Data Source and have the result be a table with all the symbols in order per Data Source.
In some cases sorting on even more than 2 columns would be desirable.
At various times I've wanted almost every column to be the 'first' sort, with some other column(s) as the sub-sort(s).
This would be tremendously helpful for managing the growing library of symbol definitions across multiple data providers.