Improved Sorting

or search frequently asked questions:

What product types are supported by Improved Sorting?
Can I set a particular sorting option to be a default one?
Can I set a particular sorting option to be default for a specific category only?
Can I display some products on top of the list in spite of actual bestsellers data?
How does a best sellers sorting option handle configurable products?
I’d like to sort products by Position but can’t find this sorting option.
Why doesn’t sorting by Bestsellers correspond to my actual data in sales reports?
How to change sorting options display name?
What to do if sorting does not work?
I have Seo Suite extension installed and sorting does not work.
Does the module work for the Enterprise edition?
I have an error when I sort by bestsellers or most rated products.
I have Better Store Search installed and sorting does not work.