Line Item Context Selectors to List of line items on a page

When two or more cards a published to a UX page and the line items are placed as context selectors it is not possible to filter or manually limit the selection of these line items without impacting the other cards. 

This seems to come from the fact that when entering the settings for line items in the page design screen you are only presented with lines from one module. There does not seem to be a way to toggle between those cards that have had their line items set as context selectors so when you limit the selection for one it removes all line items from the others. 

Can we allow the user to select which card they wish to limit and allow filtering / limiting selection across all cards whose line items are set as context selectors present on the page?