I also agree getting Connext 6.0.1 for Rolling would be fantastic.
As a security concern, @clalancette would recent security research results be mitigated as part of the deb release (e.g. the ones disclosed at Cybersecurity in the ROS 2 communication middleware, targeting the top 6 DDS implementations)? RTI seems to indicate in ICS-CERT Security Notice ICS-VU-575352 / VU#770071 | Data Distribution Service (DDS) Community RTI Connext Users that this needs to be done manually.