I would like to see an option to favorite industries. Why? Because that makes it easier to follow when the industry I care for have low waittime. Its possible to check lowest wt on industries in facilities rankin -> time, but when connected to several cities, its becomming useless, as there are many unimportant industries with low wt.
Make a star-button in the right corner of industry window, then add a favorites tab on industry rankings window. Maybe make a filter that filters out non-RGs etc.