Feature request: context menu column sorting

Hi,

Currently on pgAdmin III, to sort a column in the Edit data screen, you have
to click on the filter icon (or select Sort / Filter from the Tools menu)
and define sorts in there. What I'd like to be able to do is have something
like the following when right-clicking on a column heading:

Sort only by [column_name] asc
Sort only by [column_name] desc
Add sort by [column_name] asc
Add sort by [column_name] desc

If you had 2 columns already in the sort, and you selected one of the "sort
only" options, it would effecitvely reset filtering and apply it to a single
column again.

Maybe even introduce column heading highlighting for ones which are
filtered, and an up/down arrow depicting which ordering is being used. Sort
of like this: http://darkixion.com/pgadmin_sort.png

Thom