Custom Attribute Filters

I have noticed that the filters don’t work for custom attributes used for variations.
When selecting the custom product-specific attributes it results in a 0 results found.
Using the site-wide attributes it works as expected though.

Another suggestion would be the ability to add additional columns, such as the attribute values, or even allowing an area to add the other information from the variation, such as regular price, sale price, Stock Status, Downloadable, Virtual, etc.
I realize the price is shown, but i’d like to show the regular price – Sale price comparison in the variations.