I am sure it has been broached before this point. It would be ideal that the Matrix option could have subtotals on the rows. At the moment we can easily segregate the data on the columns but we cannot currently group the data by rows with a matrix. An example of this would be as follows:
I appreciate we are not trying to create pivot tables inside Phocas, but to group on row I believe is important. The Nest functionality does the row, but then you loose the matrix ability. This would be extremely beneficial.