Picking up on questions such as
https://knowledge.safe.com/questions/4786/null-sorter.html
and comparing the FME Sorter to Excel, which sorts empty cells to the bottom (for a numeric sort)...
I'd like to suggest adding options to the Sorter or creating a "PedanticSorter" transformer with options allowing the user to sort certain types of values to the end, including nulls, empty strings, non-numeric etc. There could be a drop down box with "sort to end" and "sort to beginning" for each value type. For non-numeric this would apply when you choose to sort numerically but some of the values are not numeric.
A further option could be a "rejected" output port. Then the drop down list for each value type would include "Output via rejected port" as a third option.