I have a feature request in for this option. Until then I wrote a Script that does it called Bolundary Bevel that is part of my Topology Scripts collection: http://pushingpoints.com/v2/pushing-points-topology-scripts-for-modo/
Its a great feature request that would have saved me extra steps over teh years. Most of my scripts are created to remove those extra steps. Like you say... they seem trivial but once you've done them enough times... you realize how much time could be saved.