[Plugin: Connections] "and" instead of "or"?

First, let me say that I absolutely love the Connections plugin and I am very grateful to the author for putting so much work into it. It’s truly appreciated.

I have what is hopefully a quick question; in the documentation, it says this:

To show entries in multiple specific categories and their children, list the categories by id seperated by commas as shown in the following example.

[connections category=’1,3,9′]

NOTE: This attribute is an operational OR function. An entry will be shown if it is in any one of the specified categories or one of their children categories.

What I need is an operational AND feature – e.g., everything that’s BOTH in the category “Louisiana” AND in the category “Bookstores”, to show bookstores in Louisiana (not everything in the database that’s a bookstore or is in Louisiana). Is there a relatively simple change I can make to the code to allow this to happen?

Thanks so much!