You asked for it.
I gave a bunch of excuses for not doing it.
Now we have it!
Previously the only way to sort in spreadsheet mode was to click on a scroll bar and pick from a luandry list of ways to sort.
We just recently redid the backend of the site (to make it 50% faster) and in doing so, somehow the sorting option works with the new infrastructure.
We will still have the drop down sort options. We might remove the repetative stuff like Price and DOM, but we will leave the more complex srting like % of tax assessment to sales price.