You know how in your My Lists page each series has a check box and you can mass move multiple series to lists? Well I think that feature would be good even outside of the My Lists page if you want to mass add a lot of series to certain lists based on genre/category you searched.

It would even help further organize you current lists since you'd be able to make fine tune adjustments based on your search since you can choose if the search pulls from a list. As it is now you have to open each series page from the search results to add them to a list if they aren't currently in a list.