I very often do 'gstat | sort -rn -k9 | head' in order to see which of my disks is busiest. It would rock my world if gstat could do the sorting itself, and do it in interactive mode. Using the "o" key to select sort column, like top does, would work. So would a command line switch.
I tried to implement this, but it was pretty hard. There were other features that I wanted too that were hard to implement. So I rewrote gstat instead. The rewrite is in ports at sysutils/gstat-rs .