We work with large groups of data and it would be a nice feature if you could have the option to allow the limiting of filters based on markings made in visualizations. This would be helpful if you want the user to be able to have access for say all the car dealers in the US and then highlight a say the North East of the US to be able to filter to all the dealers in that area (List Box multi select won't work for what we are doing since many of our attributes contains well over 1,000 entries).