If so, does it require simply a second monitor line in the local/inputs.conf file for the app?
yes,
add another monitor stanza
read here:
http://docs.splunk.com/Documentation/AddOns/released/BroIDS/Configuration
and here:
http://docs.splunk.com/Documentation/AddOns/released/BroIDS/DataTypes
make sure the specify the sourcetype as bro
hope it helps