Please explain your business case little more.
I am unable to understand your question.

if you make the page dynamic grouping, as well as loading the grid make grouping and sorting by default, the subsequent grouping is performed without sorting.
for example how to make
jQuery ("# ​​<? php echo $ grid_id?>"). jqGrid ('groupingGroupBy', vl); with options to sort vl

I have never checked this option. I'll review it and will incorporate it if feasible.
Adding it in todos.