Right now, you cannot cmd+click on the "open" icon when you're looking at articles in bulk operations.
Say I'm an author and I want to look at ALL of my articles in the knowledge base to make sure they're up to day, the only way to do this is open them one at a time, then click back, which blows away the applied author filter, so I have to reclick to filter by my name, and then open the next. I want to be able to open each article in its own tab.