It would be nice if the sort actually worked, like it used to.
If the table sorters don't work, then please report it on the bugtracker so it can be fixed.
What if a filter was added to only show the cheapest sell offer and the most expensive buy offer? You click buy (or sell), and then repeat as needed.
I don't know the full extent of what is available in the way of filtering/sorting options. That's Anaris' (and maybe Foundation's?) area. However, I don't think that would be all that useful. There is no guarantee that you will be able to make a matched deal just from the offers at opposite ends of the spectrum. You could very well have to include stuff from the middle just to make a match, and they could be hidden. Might be almost more helpful to have two tables shown, one for buys and one for sells.
