Long anchors doesn't add much value as most of the time these are from spammy sites, placing as anchors the "titles". So, having the option to limit the word count on anchors would help a lot.
This could work by adding to your database a new column counting the length of the anchor and adding it to the filter query.
But I can't imagine how long this would take to process your huge DB.
Anyway, this would be super helpful.