I do not think you will ever see that kind of filter on eBay complete listing. However, stranger things happen on eBay.
 
eBay sells the completed data information to companies like Terapeak who offer tools to search the completed data at a subscription price to sellers.  eBay will not give up the revenue it makes selling the completed data to these companies. If it started filtering the completed data on eBay directly, then it would make these companies unhappy with the competition as they would lose customers.
 
eBay allows 2 weeks of completed information to be shown on eBay search. Some categories are expanding the search (collectibles) to more than 2 weeks as per recent announcements. I found that to be a strange move on eBay's part because it would possibly affect companies like Terapeak.
 
Perhaps eBay will compete with Terapeak with its own subscription based research tools. eBay is always looking for ways to make more money.
 
I had a year subscription to Terapeak last year and access to 365 days of data (90 days of recent listings) on ebay.com USA, ebay.ca Canada and UK, Germany, Australia, France.  The ebay.com USA was the most important one to have for me. The ebay.ca just had too few sales. I always found my own sales on ebay.ca! Average pricing was useful to see what you could list an item at.  Listings were shown from highest sold price to lowest sold price then highest unsold to lowest unsold price.
 
However, I had my Terapeak account when ebay had the 99-cent free auction listings.  This skewed the sales data on prices badly as many items sold at 99 cents (with high shipping). Forced averages down a lot. So you had to look at individual listings to get a feel for a good price for an OOAK item.
 

YES!!  I agree.  I'd love that feature.......... and wouldn't it be nice to be able to look back through the years to see what items were selling for a decade ago?

I use the watch feature a lot and often have it loaded up to the 200 item limit most of the time so that I can keep tabs on what's selling.

When I look at the completed items I've been watching, one of my accounts has a column which shows the number of bids an item had (if any)........

but I've never been able to figure out how to get that to show on my other accounts.

Does anyone know?