all items mentioned above have been addressed on version 3.2.1.
The CSS styles do remain the same but with additional selectors, including the option to change your gallery columns.
One thing to notice is that the location of the html markup for the sub navigation bar ( select all, unselect all..) has change on 3.2.1, Colorbox is no longer supported and additional styles have been addd for new features and a more friendly mobile experience.