Using Toolbox it is very easy to add any kind of filter. A location-based filter for instance is very easy to add.
You will need to install a plugin like GeoIP Detectection from the WordPress Repository.
When you’ve done so, you can add the following code to your functions.php or into your own plugin.
[pastacode lang=”php” path_id=”9ef5f21b42c9d2d3d5de43cda5919d2f/d9b94501e1611ba8c17dd79e0346671ed1b02937″ file=”toolbox_example_cond_filter_geo_detect.php” highlight=”” lines=”” provider=”gist”/]
You will be able to select the conditional from the dropdown list. By default it will check if the isocode is US, but you can check on any other isoCode. A complete list of isocodes can be found here.
Of course you can write your settings and conditional to check for multiple isocodes but this should get you started.