I'm sorry to tell you that this is the only column where we have problems doing this.
There is also a bug report about it:
http://sourceforge.net/tracker/index...21&atid=388892
The main problem is to keep your selected search lines, while keeping things sorted. We cant just completely resort when an existing row changes, you would loose your selection. When a new row appears its no problem since we can add it into its correctly sorted position, without affecting row selection.
I tried several ways to make it work but it always either results in loosing the selected search rows on every new result (this makes you crazy if you try to select and download but always loose selection) or in a wrong sort order...
I will give it another try... but I cant promise anything.